691957920 has 48 divisors (see below), whose sum is σ = 2179668960. Its totient is φ = 184521984.

The previous prime is 691957909. The next prime is 691957949. The reversal of 691957920 is 29759196.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 691957920.

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 7 ways as a sum of consecutive naturals, for example, 720310 + ... + 721269.

It is an arithmetic number, because the mean of its divisors is an integer number (45409770).

Almost surely, 2^691957920 is an apocalyptic number.

691957920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691957920 is an abundant number, since it is smaller than the sum of its proper divisors (1487711040).

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

691957920 is a wasteful number, since it uses less digits than its factorization.

691957920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441597 (or 1441589 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 48.

The square root of 691957920 is about 26305.0930429831. The cubic root of 691957920 is about 884.4906130532.

The spelling of 691957920 in words is "six hundred ninety-one million, nine hundred fifty-seven thousand, nine hundred twenty".