691744812 has 24 divisors (see below), whose sum is σ = 1760805312. Its totient is φ = 209619600.

The previous prime is 691744811. The next prime is 691744813. The reversal of 691744812 is 218447196.

It is an interprime number because it is at equal distance from previous prime (691744811) and next prime (691744813).

It is not an unprimeable number, because it can be changed into a prime (691744811) 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 7 ways as a sum of consecutive naturals, for example, 2620114 + ... + 2620377.

It is an arithmetic number, because the mean of its divisors is an integer number (73366888).

Almost surely, 2^691744812 is an apocalyptic number.

It is an amenable number.

691744812 is an abundant number, since it is smaller than the sum of its proper divisors (1069060500).

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

691744812 is a wasteful number, since it uses less digits than its factorization.

691744812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5240509 (or 5240507 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 691744812 is about 26301.0420325887. The cubic root of 691744812 is about 884.3998024351.

The spelling of 691744812 in words is "six hundred ninety-one million, seven hundred forty-four thousand, eight hundred twelve".