861872613928 has 16 divisors (see below), whose sum is σ = 1617257131380. Its totient is φ = 430604045568.

The previous prime is 861872613893. The next prime is 861872613967. The reversal of 861872613928 is 829316278168.

It can be written as a sum of positive squares in 2 ways, for example, as 813788018404 + 48084595524 = 902102^2 + 219282^2 .

It is a super-4 number, since 4×861872613928⁴ (a number of 49 digits) contains 4444 as substring.

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, 41521651 + ... + 41542402.

Almost surely, 2^861872613928 is an apocalyptic number.

It is an amenable number.

861872613928 is a deficient number, since it is larger than the sum of its proper divisors (755384517452).

861872613928 is a wasteful number, since it uses less digits than its factorization.

861872613928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83065356 (or 83065352 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 61.

The spelling of 861872613928 in words is "eight hundred sixty-one billion, eight hundred seventy-two million, six hundred thirteen thousand, nine hundred twenty-eight".