28252567225 has 9 divisors (see below), whose sum is σ = 35034225517. Its totient is φ = 22601381440.

The previous prime is 28252567177. The next prime is 28252567249. The reversal of 28252567225 is 52276525282.

The square root of 28252567225 is 168085.

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

It can be written as a sum of positive squares in 4 ways, for example, as 8041964329 + 20210602896 = 89677^2 + 142164^2 .

It is not a de Polignac number, because 28252567225 - 2¹³ = 28252559033 is a prime.

It is a Duffinian number.

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, 823617 + ... + 857233.

Almost surely, 2^28252567225 is an apocalyptic number.

28252567225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28252567225 is the 168085-th square number.

28252567225 is the 84043-rd centered octagonal number.

It is an amenable number.

28252567225 is a deficient number, since it is larger than the sum of its proper divisors (6781658292).

28252567225 is an frugal number, since it uses more digits than its factorization.

28252567225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67244 (or 33622 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 46.

The spelling of 28252567225 in words is "twenty-eight billion, two hundred fifty-two million, five hundred sixty-seven thousand, two hundred twenty-five".