686718890438 has 32 divisors (see below), whose sum is σ = 1184170238976. Its totient is φ = 292575794688.

The previous prime is 686718890419. The next prime is 686718890461. The reversal of 686718890438 is 834098817686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3755645 + ... + 3934247.

It is an arithmetic number, because the mean of its divisors is an integer number (37005319968).

Almost surely, 2^686718890438 is an apocalyptic number.

686718890438 is a deficient number, since it is larger than the sum of its proper divisors (497451348538).

686718890438 is a wasteful number, since it uses less digits than its factorization.

686718890438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180228.

The product of its (nonzero) digits is 111476736, while the sum is 68.

The spelling of 686718890438 in words is "six hundred eighty-six billion, seven hundred eighteen million, eight hundred ninety thousand, four hundred thirty-eight".