664980 has 24 divisors (see below), whose sum is σ = 1862112. Its totient is φ = 177312.

The previous prime is 664973. The next prime is 664997. The reversal of 664980 is 89466.

It is a congruent number.

It is an unprimeable number.

664980 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5482 + ... + 5601.

It is an arithmetic number, because the mean of its divisors is an integer number (77588).

2⁶⁶⁴⁹⁸⁰ is an apocalyptic number.

664980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664980 is an abundant number, since it is smaller than the sum of its proper divisors (1197132).

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

664980 is a wasteful number, since it uses less digits than its factorization.

664980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11095 (or 11093 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 664980 is about 815.4630586360. The cubic root of 664980 is about 87.2843123036.

The spelling of 664980 in words is "six hundred sixty-four thousand, nine hundred eighty".