691701376 has 16 divisors (see below), whose sum is σ = 1377999090. Its totient is φ = 345850624.

The previous prime is 691701331. The next prime is 691701377. The reversal of 691701376 is 673107196.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 461390400 + 230310976 = 21480^2 + 15176^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (691701377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2701831 + ... + 2702086.

Almost surely, 2^691701376 is an apocalyptic number.

It is an amenable number.

691701376 is a deficient number, since it is larger than the sum of its proper divisors (686297714).

691701376 is an equidigital number, since it uses as much as digits as its factorization.

691701376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5403931 (or 5403919 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 691701376 is about 26300.2162728750. The cubic root of 691701376 is about 884.3812909873.

The spelling of 691701376 in words is "six hundred ninety-one million, seven hundred one thousand, three hundred seventy-six".