28402908525 has 48 divisors (see below), whose sum is σ = 55246464000. Its totient is φ = 14257140480.

The previous prime is 28402908481. The next prime is 28402908539. The reversal of 28402908525 is 52580920482.

28402908525 is a `hidden beast` number, since 284 + 0 + 290 + 85 + 2 + 5 = 666.

It is not a de Polignac number, because 28402908525 - 2²⁷ = 28268690797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1226125 + ... + 1249074.

It is an arithmetic number, because the mean of its divisors is an integer number (1150968000).

Almost surely, 2^28402908525 is an apocalyptic number.

28402908525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28402908525 is a deficient number, since it is larger than the sum of its proper divisors (26843555475).

28402908525 is a wasteful number, since it uses less digits than its factorization.

28402908525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475235 (or 2475224 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 28402908525 in words is "twenty-eight billion, four hundred two million, nine hundred eight thousand, five hundred twenty-five".