28257575525 has 12 divisors (see below), whose sum is σ = 37100535012. Its totient is φ = 21276291840.

The previous prime is 28257575477. The next prime is 28257575531. The reversal of 28257575525 is 52557575282.

It can be written as a sum of positive squares in 6 ways, for example, as 3217044961 + 25040530564 = 56719^2 + 158242^2 .

It is not a de Polignac number, because 28257575525 - 2²⁴ = 28240798309 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33243782 + ... + 33244631.

It is an arithmetic number, because the mean of its divisors is an integer number (3091711251).

Almost surely, 2^28257575525 is an apocalyptic number.

28257575525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28257575525 is a deficient number, since it is larger than the sum of its proper divisors (8842959487).

28257575525 is a wasteful number, since it uses less digits than its factorization.

28257575525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66488440 (or 66488435 counting only the distinct ones).

The product of its digits is 9800000, while the sum is 53.

The spelling of 28257575525 in words is "twenty-eight billion, two hundred fifty-seven million, five hundred seventy-five thousand, five hundred twenty-five".