631980 has 36 divisors (see below), whose sum is σ = 1917552. Its totient is φ = 168480.

The previous prime is 631979. The next prime is 631987. The reversal of 631980 is 89136.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (631987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1576 + ... + 1935.

2⁶³¹⁹⁸⁰ is an apocalyptic number.

631980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631980 is an abundant number, since it is smaller than the sum of its proper divisors (1285572).

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

631980 is a wasteful number, since it uses less digits than its factorization.

631980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526 (or 3521 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 631980 is about 794.9716976094. The cubic root of 631980 is about 85.8159032904.

The spelling of 631980 in words is "six hundred thirty-one thousand, nine hundred eighty".