31996159272 has 640 divisors, whose sum is σ = 120284144640. Its totient is φ = 7691397120.

The previous prime is 31996159249. The next prime is 31996159297. The reversal of 31996159272 is 27295169913.

31996159272 is a `hidden beast` number, since 3 + 19 + 9 + 615 + 9 + 2 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 56831263 + ... + 56831825.

It is an arithmetic number, because the mean of its divisors is an integer number (187943976).

Almost surely, 2^31996159272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31996159272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60142072320).

31996159272 is an abundant number, since it is smaller than the sum of its proper divisors (88287985368).

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

31996159272 is a wasteful number, since it uses less digits than its factorization.

31996159272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 670 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 54.

The spelling of 31996159272 in words is "thirty-one billion, nine hundred ninety-six million, one hundred fifty-nine thousand, two hundred seventy-two".