631879440 has 40 divisors (see below), whose sum is σ = 1958827008. Its totient is φ = 168501120.

The previous prime is 631879429. The next prime is 631879513. The reversal of 631879440 is 44978136.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 631879392 and 631879401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1316176 + ... + 1316655.

Almost surely, 2^631879440 is an apocalyptic number.

631879440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631879440 is an abundant number, since it is smaller than the sum of its proper divisors (1326947568).

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

631879440 is a wasteful number, since it uses less digits than its factorization.

631879440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632847 (or 2632841 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 631879440 is about 25137.2122559364. The cubic root of 631879440 is about 858.1135140319.

It can be divided in two parts, 63187 and 9440, that added together give a palindrome (72627).

The spelling of 631879440 in words is "six hundred thirty-one million, eight hundred seventy-nine thousand, four hundred forty".