31990751324 has 72 divisors (see below), whose sum is σ = 67654440000. Its totient is φ = 13181605248.

The previous prime is 31990751239. The next prime is 31990751327. The reversal of 31990751324 is 42315709913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31990751327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1346702 + ... + 1370250.

It is an arithmetic number, because the mean of its divisors is an integer number (939645000).

Almost surely, 2^31990751324 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 31990751324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33827220000).

31990751324 is an abundant number, since it is smaller than the sum of its proper divisors (35663688676).

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

31990751324 is a wasteful number, since it uses less digits than its factorization.

31990751324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23835 (or 23826 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 31990751324 in words is "thirty-one billion, nine hundred ninety million, seven hundred fifty-one thousand, three hundred twenty-four".