631861087440 has 160 divisors (see below), whose sum is σ = 2210523696000. Its totient is φ = 147896412160.

The previous prime is 631861087423. The next prime is 631861087453. The reversal of 631861087440 is 44780168136.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 631861087440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4050015 + ... + 4203134.

It is an arithmetic number, because the mean of its divisors is an integer number (13815773100).

Almost surely, 2^631861087440 is an apocalyptic number.

631861087440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631861087440 is an abundant number, since it is smaller than the sum of its proper divisors (1578662608560).

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

631861087440 is a wasteful number, since it uses less digits than its factorization.

631861087440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8253205 (or 8253199 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 631861087440 in words is "six hundred thirty-one billion, eight hundred sixty-one million, eighty-seven thousand, four hundred forty".