691406328 has 32 divisors (see below), whose sum is σ = 1731652560. Its totient is φ = 230050560.

The previous prime is 691406311. The next prime is 691406363. The reversal of 691406328 is 823604196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12493 + ... + 39228.

Almost surely, 2^691406328 is an apocalyptic number.

It is an amenable number.

691406328 is an abundant number, since it is smaller than the sum of its proper divisors (1040246232).

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

691406328 is a wasteful number, since it uses less digits than its factorization.

691406328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52287 (or 52283 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 691406328 is about 26294.6064431472. The cubic root of 691406328 is about 884.2555276401.

The spelling of 691406328 in words is "six hundred ninety-one million, four hundred six thousand, three hundred twenty-eight".