28969742025 has 81 divisors (see below), whose sum is σ = 60396800373. Its totient is φ = 13235140800.

The previous prime is 28969741943. The next prime is 28969742047. The reversal of 28969742025 is 52024796982.

The square root of 28969742025 is 170205.

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

28969742025 is a `hidden beast` number, since 28 + 96 + 97 + 420 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 576144009 + 28393598016 = 24003^2 + 168504^2 .

It is not a de Polignac number, because 28969742025 - 2⁷ = 28969741897 is a prime.

It is a super-2 number, since 2×28969742025² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 17870715 + ... + 17872335.

Almost surely, 2^28969742025 is an apocalyptic number.

28969742025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28969742025 is the 170205-th square number.

28969742025 is the 85103-rd centered octagonal number.

It is an amenable number.

28969742025 is an abundant number, since it is smaller than the sum of its proper divisors (31427058348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28969742025 is an equidigital number, since it uses as much as digits as its factorization.

28969742025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 28969742025 in words is "twenty-eight billion, nine hundred sixty-nine million, seven hundred forty-two thousand, twenty-five".