664984 has 16 divisors (see below), whose sum is σ = 1260720. Its totient is φ = 328800.

The previous prime is 664973. The next prime is 664997. The reversal of 664984 is 489466.

It is an Ulam number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397 + ... + 1219.

It is an arithmetic number, because the mean of its divisors is an integer number (78795).

2⁶⁶⁴⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

664984 is a deficient number, since it is larger than the sum of its proper divisors (595736).

664984 is a wasteful number, since it uses less digits than its factorization.

664984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930 (or 926 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 664984 is about 815.4655112266. The cubic root of 664984 is about 87.2844873147.

It can be divided in two parts, 66 and 4984, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 664984 in words is "six hundred sixty-four thousand, nine hundred eighty-four".