31993612 has 72 divisors (see below), whose sum is σ = 70066080. Its totient is φ = 12499200.

The previous prime is 31993589. The next prime is 31993613. The reversal of 31993612 is 21639913.

It is not an unprimeable number, because it can be changed into a prime (31993613) 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, 780312 + ... + 780352.

It is an arithmetic number, because the mean of its divisors is an integer number (973140).

Almost surely, 2^31993612 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 31993612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35033040).

31993612 is an abundant number, since it is smaller than the sum of its proper divisors (38072468).

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

31993612 is a wasteful number, since it uses less digits than its factorization.

31993612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 110 counting only the distinct ones).

The product of its digits is 8748, while the sum is 34.

The square root of 31993612 is about 5656.2895965465. The cubic root of 31993612 is about 317.4590833254.

The spelling of 31993612 in words is "thirty-one million, nine hundred ninety-three thousand, six hundred twelve".