31380638784 has 112 divisors (see below), whose sum is σ = 91378186560. Its totient is φ = 9425059840.

The previous prime is 31380638767. The next prime is 31380638789. The reversal of 31380638784 is 48783608313.

It is not an unprimeable number, because it can be changed into a prime (31380638789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172912 + ... + 304400.

Almost surely, 2^31380638784 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 31380638784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45689093280).

31380638784 is an abundant number, since it is smaller than the sum of its proper divisors (59997547776).

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

31380638784 is a wasteful number, since it uses less digits than its factorization.

31380638784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131628 (or 131618 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 31380638784 in words is "thirty-one billion, three hundred eighty million, six hundred thirty-eight thousand, seven hundred eighty-four".