31996045440 has 768 divisors, whose sum is σ = 124003440000. Its totient is φ = 7790985216.

The previous prime is 31996045427. The next prime is 31996045441. The reversal of 31996045440 is 4454069913.

31996045440 is a `hidden beast` number, since 3 + 19 + 96 + 0 + 4 + 544 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (31996045441) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 214738486 + ... + 214738634.

Almost surely, 2^31996045440 is an apocalyptic number.

31996045440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31996045440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62001720000).

31996045440 is an abundant number, since it is smaller than the sum of its proper divisors (92007394560).

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

31996045440 is a wasteful number, since it uses less digits than its factorization.

31996045440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 31996045440 in words is "thirty-one billion, nine hundred ninety-six million, forty-five thousand, four hundred forty".