28667569225 has 9 divisors (see below), whose sum is σ = 35548835623. Its totient is φ = 22933378120.

The previous prime is 28667569193. The next prime is 28667569243. The reversal of 28667569225 is 52296576682.

The square root of 28667569225 is 169315.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10320324921 + 18347244304 = 101589^2 + 135452^2 .

It is not a de Polignac number, because 28667569225 - 2⁵ = 28667569193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28667569225.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 829644 + ... + 863506.

Almost surely, 2^28667569225 is an apocalyptic number.

28667569225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28667569225 is the 169315-th square number.

28667569225 is the 84658-th centered octagonal number.

It is an amenable number.

28667569225 is a deficient number, since it is larger than the sum of its proper divisors (6881266398).

28667569225 is an frugal number, since it uses more digits than its factorization.

28667569225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67736 (or 33868 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 58.

The spelling of 28667569225 in words is "twenty-eight billion, six hundred sixty-seven million, five hundred sixty-nine thousand, two hundred twenty-five".