28528899025 has 81 divisors (see below), whose sum is σ = 40450798353. Its totient is φ = 19944302400.

The previous prime is 28528899023. The next prime is 28528899037. The reversal of 28528899025 is 52099882582.

The square root of 28528899025 is 168905.

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 2708265681 + 25820633344 = 52041^2 + 160688^2 .

It is not a de Polignac number, because 28528899025 - 2¹ = 28528899023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28528899023) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 343721634 + ... + 343721716.

Almost surely, 2^28528899025 is an apocalyptic number.

28528899025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28528899025 is the 168905-th square number.

28528899025 is the 84453-rd centered octagonal number.

It is an amenable number.

28528899025 is a deficient number, since it is larger than the sum of its proper divisors (11921899328).

28528899025 is an equidigital number, since it uses as much as digits as its factorization.

28528899025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 58.

The spelling of 28528899025 in words is "twenty-eight billion, five hundred twenty-eight million, eight hundred ninety-nine thousand, twenty-five".