31245991936 has 80 divisors (see below), whose sum is σ = 63581393700. Its totient is φ = 15351152640.

The previous prime is 31245991927. The next prime is 31245991937. The reversal of 31245991936 is 63919954213.

It can be written as a sum of positive squares in 2 ways, for example, as 31201689600 + 44302336 = 176640^2 + 6656^2 .

It is not an unprimeable number, because it can be changed into a prime (31245991937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31981080 + ... + 31982056.

Almost surely, 2^31245991936 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 31245991936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31790696850).

31245991936 is an abundant number, since it is smaller than the sum of its proper divisors (32335401764).

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

31245991936 is an frugal number, since it uses more digits than its factorization.

31245991936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076 (or 1040 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 52.

The spelling of 31245991936 in words is "thirty-one billion, two hundred forty-five million, nine hundred ninety-one thousand, nine hundred thirty-six".