31730123664 has 30 divisors (see below), whose sum is σ = 88800277046. Its totient is φ = 10576707840.

The previous prime is 31730123653. The next prime is 31730123699. The reversal of 31730123664 is 46632103713.

31730123664 is a `hidden beast` number, since 317 + 301 + 2 + 36 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20104971264 + 11625152400 = 141792^2 + 107820^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 110173897 + ... + 110174184.

Almost surely, 2^31730123664 is an apocalyptic number.

It is an amenable number.

31730123664 is an abundant number, since it is smaller than the sum of its proper divisors (57070153382).

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

31730123664 is a wasteful number, since it uses less digits than its factorization.

31730123664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220348095 (or 220348086 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The spelling of 31730123664 in words is "thirty-one billion, seven hundred thirty million, one hundred twenty-three thousand, six hundred sixty-four".