631653240 has 64 divisors (see below), whose sum is σ = 1917820800. Its totient is φ = 166408832.

The previous prime is 631653131. The next prime is 631653259. The reversal of 631653240 is 42356136.

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 = 631653198 and 631653207.

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, 21750 + ... + 41669.

It is an arithmetic number, because the mean of its divisors is an integer number (29965950).

Almost surely, 2^631653240 is an apocalyptic number.

631653240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631653240 is an abundant number, since it is smaller than the sum of its proper divisors (1286167560).

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

631653240 is a wasteful number, since it uses less digits than its factorization.

631653240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63516 (or 63512 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 631653240 is about 25132.7125475942. The cubic root of 631653240 is about 858.0111060771.

The spelling of 631653240 in words is "six hundred thirty-one million, six hundred fifty-three thousand, two hundred forty".