28645687664 has 40 divisors (see below), whose sum is σ = 60585788928. Its totient is φ = 13012332480.

The previous prime is 28645687627. The next prime is 28645687717. The reversal of 28645687664 is 46678654682.

It is a junction number, because it is equal to n+sod(n) for n = 28645687597 and 28645687606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223859 + ... + 327725.

Almost surely, 2^28645687664 is an apocalyptic number.

It is an amenable number.

28645687664 is an abundant number, since it is smaller than the sum of its proper divisors (31940101264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28645687664 is a wasteful number, since it uses less digits than its factorization.

28645687664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105453 (or 105447 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 62.

The spelling of 28645687664 in words is "twenty-eight billion, six hundred forty-five million, six hundred eighty-seven thousand, six hundred sixty-four".