31987725440 has 192 divisors, whose sum is σ = 85763966400. Its totient is φ = 11314114560.

The previous prime is 31987725437. The next prime is 31987725491. The reversal of 31987725440 is 4452778913.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9636101 + ... + 9639419.

It is an arithmetic number, because the mean of its divisors is an integer number (446687325).

Almost surely, 2^31987725440 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 31987725440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42881983200).

31987725440 is an abundant number, since it is smaller than the sum of its proper divisors (53776240960).

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

31987725440 is a wasteful number, since it uses less digits than its factorization.

31987725440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423 (or 3374 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 31987725440 in words is "thirty-one billion, nine hundred eighty-seven million, seven hundred twenty-five thousand, four hundred forty".