31631240660 has 48 divisors (see below), whose sum is σ = 70081334400. Its totient is φ = 11959208064.

The previous prime is 31631240617. The next prime is 31631240699. The reversal of 31631240660 is 6604213613.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72014 + ... + 261626.

It is an arithmetic number, because the mean of its divisors is an integer number (1460027800).

Almost surely, 2^31631240660 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 31631240660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35040667200).

31631240660 is an abundant number, since it is smaller than the sum of its proper divisors (38450093740).

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

31631240660 is a wasteful number, since it uses less digits than its factorization.

31631240660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190080 (or 190078 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 31631240660 in words is "thirty-one billion, six hundred thirty-one million, two hundred forty thousand, six hundred sixty".