631637690 has 32 divisors (see below), whose sum is σ = 1183729680. Its totient is φ = 242371584.

The previous prime is 631637689. The next prime is 631637711. The reversal of 631637690 is 96736136.

It can be written as a sum of positive squares in 8 ways, for example, as 202692169 + 428945521 = 14237^2 + 20711^2 .

It is a super-2 number, since 2×631637690² = 797932342857072200, which contains 22 as substring.

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, 38594 + ... + 52466.

Almost surely, 2^631637690 is an apocalyptic number.

631637690 is a deficient number, since it is larger than the sum of its proper divisors (552091990).

631637690 is a wasteful number, since it uses less digits than its factorization.

631637690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14066.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 631637690 is about 25132.4031879166. The cubic root of 631637690 is about 858.0040651981.

The spelling of 631637690 in words is "six hundred thirty-one million, six hundred thirty-seven thousand, six hundred ninety".