691986032 has 20 divisors (see below), whose sum is σ = 1344575400. Its totient is φ = 344998848.

The previous prime is 691985989. The next prime is 691986077. The reversal of 691986032 is 230689196.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56378 + ... + 67545.

It is an arithmetic number, because the mean of its divisors is an integer number (67228770).

Almost surely, 2^691986032 is an apocalyptic number.

It is an amenable number.

691986032 is a deficient number, since it is larger than the sum of its proper divisors (652589368).

691986032 is a wasteful number, since it uses less digits than its factorization.

691986032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124280 (or 124274 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 691986032 is about 26305.6273827484. The cubic root of 691986032 is about 884.5025908834.

The spelling of 691986032 in words is "six hundred ninety-one million, nine hundred eighty-six thousand, thirty-two".