691439976 has 48 divisors (see below), whose sum is σ = 1942012800. Its totient is φ = 230479344.

The previous prime is 691439951. The next prime is 691439989. The reversal of 691439976 is 679934196.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175896 + ... + 179783.

It is an arithmetic number, because the mean of its divisors is an integer number (40458600).

Almost surely, 2^691439976 is an apocalyptic number.

It is an amenable number.

691439976 is an abundant number, since it is smaller than the sum of its proper divisors (1250572824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691439976 is a wasteful number, since it uses less digits than its factorization.

691439976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355700 (or 355684 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 691439976 is about 26295.2462623950. The cubic root of 691439976 is about 884.2698718090.

The spelling of 691439976 in words is "six hundred ninety-one million, four hundred thirty-nine thousand, nine hundred seventy-six".