31440036320 has 384 divisors, whose sum is σ = 96315899904. Its totient is φ = 9411840000.

The previous prime is 31440036281. The next prime is 31440036337. The reversal of 31440036320 is 2363004413.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31440036320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 72946505 + ... + 72946935.

It is an arithmetic number, because the mean of its divisors is an integer number (250822656).

Almost surely, 2^31440036320 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 31440036320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48157949952).

31440036320 is an abundant number, since it is smaller than the sum of its proper divisors (64875863584).

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

31440036320 is a wasteful number, since it uses less digits than its factorization.

31440036320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

The spelling of 31440036320 in words is "thirty-one billion, four hundred forty million, thirty-six thousand, three hundred twenty".