691020464 has 20 divisors (see below), whose sum is σ = 1397063856. Its totient is φ = 330487872.

The previous prime is 691020457. The next prime is 691020479. The reversal of 691020464 is 464020196.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 691020464.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938519 + ... + 939254.

Almost surely, 2^691020464 is an apocalyptic number.

It is an amenable number.

691020464 is an abundant number, since it is smaller than the sum of its proper divisors (706043392).

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

691020464 is a wasteful number, since it uses less digits than its factorization.

691020464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877804 (or 1877798 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 691020464 is about 26287.2680969324. The cubic root of 691020464 is about 884.0910002346.

The spelling of 691020464 in words is "six hundred ninety-one million, twenty thousand, four hundred sixty-four".