28387285204 has 12 divisors (see below), whose sum is σ = 49683840724. Its totient is φ = 14191902144.

The previous prime is 28387285139. The next prime is 28387285211. The reversal of 28387285204 is 40258278382.

It can be written as a sum of positive squares in 2 ways, for example, as 1497844804 + 26889440400 = 38702^2 + 163980^2 .

It is a super-2 number, since 2×28387285204² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398067 + ... + 463930.

Almost surely, 2^28387285204 is an apocalyptic number.

It is an amenable number.

28387285204 is a deficient number, since it is larger than the sum of its proper divisors (21296555520).

28387285204 is a wasteful number, since it uses less digits than its factorization.

28387285204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870234 (or 870232 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 49.

The spelling of 28387285204 in words is "twenty-eight billion, three hundred eighty-seven million, two hundred eighty-five thousand, two hundred four".