39678990687 has 24 divisors (see below), whose sum is σ = 65831001600. Its totient is φ = 22559763600.

The previous prime is 39678990679. The next prime is 39678990691. The reversal of 39678990687 is 78609987693.

39678990687 is a `hidden beast` number, since 396 + 78 + 9 + 90 + 6 + 87 = 666.

It is not a de Polignac number, because 39678990687 - 2³ = 39678990679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39678990187) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1569939 + ... + 1595012.

It is an arithmetic number, because the mean of its divisors is an integer number (2742958400).

Almost surely, 2^39678990687 is an apocalyptic number.

39678990687 is a deficient number, since it is larger than the sum of its proper divisors (26152010913).

39678990687 is a wasteful number, since it uses less digits than its factorization.

39678990687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165163 (or 3165160 counting only the distinct ones).

The product of its (nonzero) digits is 246903552, while the sum is 72.

The spelling of 39678990687 in words is "thirty-nine billion, six hundred seventy-eight million, nine hundred ninety thousand, six hundred eighty-seven".