691479372 has 18 divisors (see below), whose sum is σ = 1613664444. Its totient is φ = 230462760.

The previous prime is 691479367. The next prime is 691479409. The reversal of 691479372 is 273974196.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87297 + ... + 94887.

Almost surely, 2^691479372 is an apocalyptic number.

It is an amenable number.

691479372 is an abundant number, since it is smaller than the sum of its proper divisors (922185072).

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

691479372 is an frugal number, since it uses more digits than its factorization.

691479372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15189 (or 7596 counting only the distinct ones).

The product of its digits is 571536, while the sum is 48.

The square root of 691479372 is about 26295.9953605107. The cubic root of 691479372 is about 884.2866657634.

Multiplying 691479372 by its sum of digits (48), we get a square (33191009856 = 182184²).

The spelling of 691479372 in words is "six hundred ninety-one million, four hundred seventy-nine thousand, three hundred seventy-two".