631287880 has 32 divisors (see below), whose sum is σ = 1421695800. Its totient is φ = 252284416.

The previous prime is 631287871. The next prime is 631287883. The reversal of 631287880 is 88782136.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 627101764 + 4186116 = 25042^2 + 2046^2 .

It is not an unprimeable number, because it can be changed into a prime (631287883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41106 + ... + 54334.

Almost surely, 2^631287880 is an apocalyptic number.

It is an amenable number.

631287880 is an abundant number, since it is smaller than the sum of its proper divisors (790407920).

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

631287880 is a wasteful number, since it uses less digits than its factorization.

631287880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14433 (or 14429 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 631287880 is about 25125.4428816688. The cubic root of 631287880 is about 857.8456443023.

The spelling of 631287880 in words is "six hundred thirty-one million, two hundred eighty-seven thousand, eight hundred eighty".