31677391520 has 24 divisors (see below), whose sum is σ = 74837837844. Its totient is φ = 12670956544.

The previous prime is 31677391513. The next prime is 31677391531. The reversal of 31677391520 is 2519377613.

It can be written as a sum of positive squares in 2 ways, for example, as 31381413904 + 295977616 = 177148^2 + 17204^2 .

It is a super-2 number, since 2×31677391520² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98991689 + ... + 98992008.

Almost surely, 2^31677391520 is an apocalyptic number.

It is an amenable number.

31677391520 is an abundant number, since it is smaller than the sum of its proper divisors (43160446324).

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

31677391520 is a wasteful number, since it uses less digits than its factorization.

31677391520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197983712 (or 197983704 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 44.

The spelling of 31677391520 in words is "thirty-one billion, six hundred seventy-seven million, three hundred ninety-one thousand, five hundred twenty".