635980 has 12 divisors (see below), whose sum is σ = 1335600. Its totient is φ = 254384.

The previous prime is 635977. The next prime is 635981. The reversal of 635980 is 89536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15880 + ... + 15919.

It is an arithmetic number, because the mean of its divisors is an integer number (111300).

2⁶³⁵⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

635980 is an abundant number, since it is smaller than the sum of its proper divisors (699620).

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

635980 is a wasteful number, since it uses less digits than its factorization.

635980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31808 (or 31806 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 635980 is about 797.4835421499. The cubic root of 635980 is about 85.9965745886.

The spelling of 635980 in words is "six hundred thirty-five thousand, nine hundred eighty".