8557621928 has 16 divisors (see below), whose sum is σ = 16050043680. Its totient is φ = 4277610288.

The previous prime is 8557621927. The next prime is 8557621931. The reversal of 8557621928 is 8291267558.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 8557621928.

It is not an unprimeable number, because it can be changed into a prime (8557621927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119426 + ... + 177137.

It is an arithmetic number, because the mean of its divisors is an integer number (1003127730).

Almost surely, 2^8557621928 is an apocalyptic number.

It is an amenable number.

8557621928 is a deficient number, since it is larger than the sum of its proper divisors (7492421752).

8557621928 is a wasteful number, since it uses less digits than its factorization.

8557621928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300176 (or 300172 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 53.

The square root of 8557621928 is about 92507.4155297833. The cubic root of 8557621928 is about 2045.4287934606.

The spelling of 8557621928 in words is "eight billion, five hundred fifty-seven million, six hundred twenty-one thousand, nine hundred twenty-eight".