28656509564 has 12 divisors (see below), whose sum is σ = 50152517688. Its totient is φ = 14327218800.

The previous prime is 28656509551. The next prime is 28656509579. The reversal of 28656509564 is 46590565682.

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, 195002 + ... + 308769.

It is an arithmetic number, because the mean of its divisors is an integer number (4179376474).

Almost surely, 2^28656509564 is an apocalyptic number.

It is an amenable number.

28656509564 is a deficient number, since it is larger than the sum of its proper divisors (21496008124).

28656509564 is a wasteful number, since it uses less digits than its factorization.

28656509564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517996 (or 517994 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 56.

The spelling of 28656509564 in words is "twenty-eight billion, six hundred fifty-six million, five hundred nine thousand, five hundred sixty-four".