631495440 has 100 divisors (see below), whose sum is σ = 2193299724. Its totient is φ = 168397056.

The previous prime is 631495411. The next prime is 631495471. The reversal of 631495440 is 44594136.

It can be written as a sum of positive squares in 2 ways, for example, as 327899664 + 303595776 = 18108^2 + 17424^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 631495395 and 631495404.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42247 + ... + 55206.

Almost surely, 2^631495440 is an apocalyptic number.

631495440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631495440 is an abundant number, since it is smaller than the sum of its proper divisors (1561804284).

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

631495440 is a wasteful number, since it uses less digits than its factorization.

631495440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97478 (or 97463 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 631495440 is about 25129.5730166670. The cubic root of 631495440 is about 857.9396505061.

The spelling of 631495440 in words is "six hundred thirty-one million, four hundred ninety-five thousand, four hundred forty".