691656992 has 24 divisors (see below), whose sum is σ = 1466446716. Its totient is φ = 319226112.

The previous prime is 691656991. The next prime is 691656997. The reversal of 691656992 is 299656196.

It can be written as a sum of positive squares in 2 ways, for example, as 559038736 + 132618256 = 23644^2 + 11516^2 .

It is not an unprimeable number, because it can be changed into a prime (691656991) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 830903 + ... + 831734.

Almost surely, 2^691656992 is an apocalyptic number.

It is an amenable number.

691656992 is an abundant number, since it is smaller than the sum of its proper divisors (774789724).

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

691656992 is a wasteful number, since it uses less digits than its factorization.

691656992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662660 (or 1662652 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 53.

The square root of 691656992 is about 26299.3724639962. The cubic root of 691656992 is about 884.3623747227.

The spelling of 691656992 in words is "six hundred ninety-one million, six hundred fifty-six thousand, nine hundred ninety-two".