631728980 has 24 divisors (see below), whose sum is σ = 1328214888. Its totient is φ = 252389888.

The previous prime is 631728941. The next prime is 631728991. The reversal of 631728980 is 89827136.

It can be written as a sum of positive squares in 4 ways, for example, as 219395344 + 412333636 = 14812^2 + 20306^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1289 + ... + 35568.

It is an arithmetic number, because the mean of its divisors is an integer number (55342287).

Almost surely, 2^631728980 is an apocalyptic number.

It is an amenable number.

631728980 is an abundant number, since it is smaller than the sum of its proper divisors (696485908).

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

631728980 is a wasteful number, since it uses less digits than its factorization.

631728980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37723 (or 37721 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 631728980 is about 25134.2193035710. The cubic root of 631728980 is about 858.0453987131.

The spelling of 631728980 in words is "six hundred thirty-one million, seven hundred twenty-eight thousand, nine hundred eighty".