861899676 has 24 divisors (see below), whose sum is σ = 2193926784. Its totient is φ = 261181680.

The previous prime is 861899669. The next prime is 861899693. The reversal of 861899676 is 676998168.

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, 3264640 + ... + 3264903.

It is an arithmetic number, because the mean of its divisors is an integer number (91413616).

Almost surely, 2^861899676 is an apocalyptic number.

It is an amenable number.

861899676 is an abundant number, since it is smaller than the sum of its proper divisors (1332027108).

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

861899676 is a wasteful number, since it uses less digits than its factorization.

861899676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6529561 (or 6529559 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 60.

The square root of 861899676 is about 29358.1279375917. The cubic root of 861899676 is about 951.6682326157.

The spelling of 861899676 in words is "eight hundred sixty-one million, eight hundred ninety-nine thousand, six hundred seventy-six".