312997688 has 16 divisors (see below), whose sum is σ = 600519480. Its totient is φ = 152859168.

The previous prime is 312997681. The next prime is 312997691. The reversal of 312997688 is 886799213.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312997681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454595 + ... + 455282.

Almost surely, 2^312997688 is an apocalyptic number.

It is an amenable number.

312997688 is a deficient number, since it is larger than the sum of its proper divisors (287521792).

312997688 is a wasteful number, since it uses less digits than its factorization.

312997688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909926 (or 909922 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 53.

The square root of 312997688 is about 17691.7406718502. The cubic root of 312997688 is about 678.9644618934.

The spelling of 312997688 in words is "three hundred twelve million, nine hundred ninety-seven thousand, six hundred eighty-eight".