31368415616 has 64 divisors (see below), whose sum is σ = 65313864000. Its totient is φ = 14987083776.

The previous prime is 31368415607. The next prime is 31368415633. The reversal of 31368415616 is 61651486313.

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

It is a super-2 number, since 2×31368415616² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316505 + ... + 403623.

It is an arithmetic number, because the mean of its divisors is an integer number (1020529125).

Almost surely, 2^31368415616 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 31368415616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32656932000).

31368415616 is an abundant number, since it is smaller than the sum of its proper divisors (33945448384).

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

31368415616 is an equidigital number, since it uses as much as digits as its factorization.

31368415616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87259 (or 87247 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The spelling of 31368415616 in words is "thirty-one billion, three hundred sixty-eight million, four hundred fifteen thousand, six hundred sixteen".