637980 has 96 divisors (see below), whose sum is σ = 2150400. Its totient is φ = 141120.

The previous prime is 637939. The next prime is 638023. The reversal of 637980 is 89736.

It is a happy number.

637980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20565 + ... + 20595.

It is an arithmetic number, because the mean of its divisors is an integer number (22400).

2⁶³⁷⁹⁸⁰ is an apocalyptic number.

637980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 637980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1075200).

637980 is an abundant number, since it is smaller than the sum of its proper divisors (1512420).

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

637980 is a wasteful number, since it uses less digits than its factorization.

637980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 637980 is about 798.7365022334. The cubic root of 637980 is about 86.0866262525.

The spelling of 637980 in words is "six hundred thirty-seven thousand, nine hundred eighty".