31612478656 has 224 divisors, whose sum is σ = 75457751040. Its totient is φ = 12972441600.

The previous prime is 31612478641. The next prime is 31612478693. The reversal of 31612478656 is 65687421613.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51569806 + ... + 51570418.

It is an arithmetic number, because the mean of its divisors is an integer number (336864960).

Almost surely, 2^31612478656 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 31612478656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37728875520).

31612478656 is an abundant number, since it is smaller than the sum of its proper divisors (43845272384).

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

31612478656 is a wasteful number, since it uses less digits than its factorization.

31612478656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823 (or 813 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The spelling of 31612478656 in words is "thirty-one billion, six hundred twelve million, four hundred seventy-eight thousand, six hundred fifty-six".