631375640 has 64 divisors (see below), whose sum is σ = 1625702400. Its totient is φ = 216183168.

The previous prime is 631375637. The next prime is 631375651. The reversal of 631375640 is 46573136.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 631375640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402137 + ... + 403703.

It is an arithmetic number, because the mean of its divisors is an integer number (25401600).

Almost surely, 2^631375640 is an apocalyptic number.

It is an amenable number.

631375640 is an abundant number, since it is smaller than the sum of its proper divisors (994326760).

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

631375640 is a wasteful number, since it uses less digits than its factorization.

631375640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024 (or 3020 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 631375640 is about 25127.1892578537. The cubic root of 631375640 is about 857.8853942841.

The spelling of 631375640 in words is "six hundred thirty-one million, three hundred seventy-five thousand, six hundred forty".