31978036608 has 384 divisors, whose sum is σ = 103531991040. Its totient is φ = 8709120000.

The previous prime is 31978036589. The next prime is 31978036613. The reversal of 31978036608 is 80663087913.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42580233 + ... + 42580983.

It is an arithmetic number, because the mean of its divisors is an integer number (269614560).

Almost surely, 2^31978036608 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 31978036608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51765995520).

31978036608 is an abundant number, since it is smaller than the sum of its proper divisors (71553954432).

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

31978036608 is a wasteful number, since it uses less digits than its factorization.

31978036608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 31978036608 in words is "thirty-one billion, nine hundred seventy-eight million, thirty-six thousand, six hundred eight".