691689836 has 6 divisors (see below), whose sum is σ = 1210457220. Its totient is φ = 345844916.

The previous prime is 691689821. The next prime is 691689857. The reversal of 691689836 is 638986196.

691689836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86461226 + ... + 86461233.

It is an arithmetic number, because the mean of its divisors is an integer number (201742870).

Almost surely, 2^691689836 is an apocalyptic number.

It is an amenable number.

691689836 is a deficient number, since it is larger than the sum of its proper divisors (518767384).

691689836 is a wasteful number, since it uses less digits than its factorization.

691689836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172922463 (or 172922461 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 56.

The square root of 691689836 is about 26299.9968821291. The cubic root of 691689836 is about 884.3763727682.

The spelling of 691689836 in words is "six hundred ninety-one million, six hundred eighty-nine thousand, eight hundred thirty-six".