Интересные свойства чисел

object(ArrayObject)#852 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(110) "Рабочая программа внеурочной деятельности "Юный математик" "
    ["seo_title"] => string(66) "rabochaia-proghramma-vnieurochnoi-dieiatiel-nosti-iunyi-matiematik"
    ["file_id"] => string(6) "116985"
    ["category_seo"] => string(10) "matematika"
    ["subcategory_seo"] => string(7) "prochee"
    ["date"] => string(10) "1412677618"
  }
}

object(ArrayObject)#874 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(103) "Математическая игра для учащихся 7 - 8 классов. Поле чудес"
    ["seo_title"] => string(70) "matiematichieskaia-ighra-dlia-uchashchikhsia-7-8-klassov-polie-chudies"
    ["file_id"] => string(6) "253400"
    ["category_seo"] => string(10) "matematika"
    ["subcategory_seo"] => string(12) "meropriyatia"
    ["date"] => string(10) "1447594397"
  }
}

object(ArrayObject)#852 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(38) ""Познавай-ка" - 5 класс"
    ["seo_title"] => string(16) "poznavaika5klass"
    ["file_id"] => string(6) "264643"
    ["category_seo"] => string(10) "matematika"
    ["subcategory_seo"] => string(12) "planirovanie"
    ["date"] => string(10) "1449755872"
  }
}

object(ArrayObject)#874 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(163) "Урок-игра "Счастливый случай" по теме "Сложение, вычитание и умножение натуральных чисел" "
    ["seo_title"] => string(100) "urok-ighra-schastlivyi-sluchai-po-tiemie-slozhieniie-vychitaniie-i-umnozhieniie-natural-nykh-chisiel"
    ["file_id"] => string(6) "157150"
    ["category_seo"] => string(10) "matematika"
    ["subcategory_seo"] => string(5) "uroki"
    ["date"] => string(10) "1421561913"
  }
}

object(ArrayObject)#852 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(144) "Разработка урока по математике по теме: "Сложение и вычитание чисел столбиком" "
    ["seo_title"] => string(86) "razrabotka-uroka-po-matiematikie-po-tiemie-slozhieniie-i-vychitaniie-chisiel-stolbikom"
    ["file_id"] => string(6) "134399"
    ["category_seo"] => string(10) "matematika"
    ["subcategory_seo"] => string(5) "uroki"
    ["date"] => string(10) "1416743509"
  }
}