31745763440 has 20 divisors (see below), whose sum is σ = 73808900184. Its totient is φ = 12698305344.

The previous prime is 31745763377. The next prime is 31745763449. The reversal of 31745763440 is 4436754713.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 31745763391 and 31745763400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31745763449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198410942 + ... + 198411101.

Almost surely, 2^31745763440 is an apocalyptic number.

It is an amenable number.

31745763440 is an abundant number, since it is smaller than the sum of its proper divisors (42063136744).

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

31745763440 is a wasteful number, since it uses less digits than its factorization.

31745763440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396822056 (or 396822050 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 44.

The spelling of 31745763440 in words is "thirty-one billion, seven hundred forty-five million, seven hundred sixty-three thousand, four hundred forty".