31172233328 has 80 divisors (see below), whose sum is σ = 65357424000. Its totient is φ = 14349643776.

The previous prime is 31172233327. The next prime is 31172233331. The reversal of 31172233328 is 82333227113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31172233327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2335538 + ... + 2348846.

It is an arithmetic number, because the mean of its divisors is an integer number (816967800).

Almost surely, 2^31172233328 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 31172233328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32678712000).

31172233328 is an abundant number, since it is smaller than the sum of its proper divisors (34185190672).

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

31172233328 is a wasteful number, since it uses less digits than its factorization.

31172233328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13522 (or 13516 counting only the distinct ones).

The product of its digits is 36288, while the sum is 35.

The spelling of 31172233328 in words is "thirty-one billion, one hundred seventy-two million, two hundred thirty-three thousand, three hundred twenty-eight".