861862564 has 12 divisors (see below), whose sum is σ = 1522097500. Its totient is φ = 426977568.

The previous prime is 861862543. The next prime is 861862577. The reversal of 861862564 is 465268168.

It can be written as a sum of positive squares in 2 ways, for example, as 220760164 + 641102400 = 14858^2 + 25320^2 .

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, 987939 + ... + 988810.

Almost surely, 2^861862564 is an apocalyptic number.

It is an amenable number.

861862564 is a deficient number, since it is larger than the sum of its proper divisors (660234936).

861862564 is a wasteful number, since it uses less digits than its factorization.

861862564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976862 (or 1976860 counting only the distinct ones).

The product of its digits is 552960, while the sum is 46.

The square root of 861862564 is about 29357.4958741375. The cubic root of 861862564 is about 951.6545733236.

The spelling of 861862564 in words is "eight hundred sixty-one million, eight hundred sixty-two thousand, five hundred sixty-four".