864921976 has 16 divisors (see below), whose sum is σ = 1636608600. Its totient is φ = 428493024.

The previous prime is 864921947. The next prime is 864921997. The reversal of 864921976 is 679129468.

It is a happy number.

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, 495070 + ... + 496813.

Almost surely, 2^864921976 is an apocalyptic number.

It is an amenable number.

864921976 is a deficient number, since it is larger than the sum of its proper divisors (771686624).

864921976 is a wasteful number, since it uses less digits than its factorization.

864921976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991998 (or 991994 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The square root of 864921976 is about 29409.5558619983. Note that the first 3 decimals coincide. The cubic root of 864921976 is about 952.7792944672.

It can be divided in two parts, 8649 and 21976, that added together give a square (30625 = 175²).

The spelling of 864921976 in words is "eight hundred sixty-four million, nine hundred twenty-one thousand, nine hundred seventy-six".