31222975872 has 64 divisors (see below), whose sum is σ = 90475680960. Its totient is φ = 9461506560.

The previous prime is 31222975859. The next prime is 31222975913. The reversal of 31222975872 is 27857922213.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3691678 + ... + 3700125.

It is an arithmetic number, because the mean of its divisors is an integer number (1413682515).

Almost surely, 2^31222975872 is an apocalyptic number.

31222975872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31222975872 is an abundant number, since it is smaller than the sum of its proper divisors (59252705088).

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

31222975872 is a wasteful number, since it uses less digits than its factorization.

31222975872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7391831 (or 7391819 counting only the distinct ones).

The product of its digits is 846720, while the sum is 48.

The spelling of 31222975872 in words is "thirty-one billion, two hundred twenty-two million, nine hundred seventy-five thousand, eight hundred seventy-two".