931142640 has 80 divisors (see below), whose sum is σ = 2953703808. Its totient is φ = 242527488.

The previous prime is 931142627. The next prime is 931142651. The reversal of 931142640 is 46241139.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 931142598 and 931142607.

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, 34794 + ... + 55433.

Almost surely, 2^931142640 is an apocalyptic number.

It is an amenable number.

931142640 is an abundant number, since it is smaller than the sum of its proper divisors (2022561168).

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

931142640 is a wasteful number, since it uses less digits than its factorization.

931142640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90286 (or 90280 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 931142640 is about 30514.6299338530. The cubic root of 931142640 is about 976.4996042428.

Adding to 931142640 its reverse (46241139), we get a palindrome (977383779).

The spelling of 931142640 in words is "nine hundred thirty-one million, one hundred forty-two thousand, six hundred forty".