28608720664 has 16 divisors (see below), whose sum is σ = 53664319800. Its totient is φ = 14298235392.

The previous prime is 28608720653. The next prime is 28608720671. The reversal of 28608720664 is 46602780682.

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, 745737 + ... + 783160.

Almost surely, 2^28608720664 is an apocalyptic number.

It is an amenable number.

28608720664 is a deficient number, since it is larger than the sum of its proper divisors (25055599136).

28608720664 is a wasteful number, since it uses less digits than its factorization.

28608720664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531242 (or 1531238 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 28608720664 in words is "twenty-eight billion, six hundred eight million, seven hundred twenty thousand, six hundred sixty-four".