631785320 has 16 divisors (see below), whose sum is σ = 1421517060. Its totient is φ = 252714112.

The previous prime is 631785317. The next prime is 631785353. The reversal of 631785320 is 23587136.

It can be written as a sum of positive squares in 2 ways, for example, as 619910404 + 11874916 = 24898^2 + 3446^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7897277 + ... + 7897356.

Almost surely, 2^631785320 is an apocalyptic number.

It is an amenable number.

631785320 is an abundant number, since it is smaller than the sum of its proper divisors (789731740).

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

631785320 is a wasteful number, since it uses less digits than its factorization.

631785320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15794644 (or 15794640 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 631785320 is about 25135.3400613558. The cubic root of 631785320 is about 858.0709058754.

The spelling of 631785320 in words is "six hundred thirty-one million, seven hundred eighty-five thousand, three hundred twenty".