28597810644 has 48 divisors (see below), whose sum is σ = 79845743040. Its totient is φ = 8799325920.

The previous prime is 28597810627. The next prime is 28597810673. The reversal of 28597810644 is 44601879582.

It is a happy number.

28597810644 is a `hidden beast` number, since 2 + 8 + 597 + 8 + 1 + 0 + 6 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10183002 + ... + 10185809.

It is an arithmetic number, because the mean of its divisors is an integer number (1663452980).

Almost surely, 2^28597810644 is an apocalyptic number.

It is an amenable number.

28597810644 is an abundant number, since it is smaller than the sum of its proper divisors (51247932396).

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

28597810644 is a wasteful number, since it uses less digits than its factorization.

28597810644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20368837 (or 20368829 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 28597810644 in words is "twenty-eight billion, five hundred ninety-seven million, eight hundred ten thousand, six hundred forty-four".