31982447440 has 20 divisors (see below), whose sum is σ = 74359190484. Its totient is φ = 12792978944.

The previous prime is 31982447411. The next prime is 31982447447. The reversal of 31982447440 is 4474428913.

It can be written as a sum of positive squares in 2 ways, for example, as 22285712656 + 9696734784 = 149284^2 + 98472^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31982447447) 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, 199890217 + ... + 199890376.

Almost surely, 2^31982447440 is an apocalyptic number.

It is an amenable number.

31982447440 is an abundant number, since it is smaller than the sum of its proper divisors (42376743044).

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

31982447440 is a wasteful number, since it uses less digits than its factorization.

31982447440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399780606 (or 399780600 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 31982447440 in words is "thirty-one billion, nine hundred eighty-two million, four hundred forty-seven thousand, four hundred forty".