31275657648 has 30 divisors (see below), whose sum is σ = 87528403404. Its totient is φ = 10425219168.

The previous prime is 31275657641. The next prime is 31275657671. The reversal of 31275657648 is 84675657213.

31275657648 is a `hidden beast` number, since 3 + 1 + 2 + 7 + 565 + 76 + 4 + 8 = 666.

It is a super-2 number, since 2×31275657648² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31275657594 and 31275657603.

It is not an unprimeable number, because it can be changed into a prime (31275657641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108595890 + ... + 108596177.

Almost surely, 2^31275657648 is an apocalyptic number.

It is an amenable number.

31275657648 is an abundant number, since it is smaller than the sum of its proper divisors (56252745756).

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

31275657648 is a wasteful number, since it uses less digits than its factorization.

31275657648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217192081 (or 217192072 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The spelling of 31275657648 in words is "thirty-one billion, two hundred seventy-five million, six hundred fifty-seven thousand, six hundred forty-eight".