28785407164 has 12 divisors (see below), whose sum is σ = 50503962600. Its totient is φ = 14355703568.

The previous prime is 28785407159. The next prime is 28785407173. The reversal of 28785407164 is 46170458782.

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, 9248254 + ... + 9251365.

It is an arithmetic number, because the mean of its divisors is an integer number (4208663550).

Almost surely, 2^28785407164 is an apocalyptic number.

It is an amenable number.

28785407164 is a deficient number, since it is larger than the sum of its proper divisors (21718555436).

28785407164 is a wasteful number, since it uses less digits than its factorization.

28785407164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18500012 (or 18500010 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 52.

The spelling of 28785407164 in words is "twenty-eight billion, seven hundred eighty-five million, four hundred seven thousand, one hundred sixty-four".