28808660025 has 72 divisors (see below), whose sum is σ = 52487158464. Its totient is φ = 15101654400.

The previous prime is 28808660017. The next prime is 28808660029. The reversal of 28808660025 is 52006680882.

It is not a de Polignac number, because 28808660025 - 2³ = 28808660017 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (28808660029) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5540727 + ... + 5545923.

It is an arithmetic number, because the mean of its divisors is an integer number (728988312).

Almost surely, 2^28808660025 is an apocalyptic number.

28808660025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28808660025 is a deficient number, since it is larger than the sum of its proper divisors (23678498439).

28808660025 is a wasteful number, since it uses less digits than its factorization.

28808660025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5631 (or 5623 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 28808660025 in words is "twenty-eight billion, eight hundred eight million, six hundred sixty thousand, twenty-five".