660404 has 12 divisors (see below), whose sum is σ = 1167264. Its totient is φ = 326904.

The previous prime is 660403. The next prime is 660409. The reversal of 660404 is 404066.

It is a super-2 number, since 2×660404² = 872266886432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660403) 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, 344 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (97272).

2⁶⁶⁰⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

660404 is a deficient number, since it is larger than the sum of its proper divisors (506860).

660404 is a wasteful number, since it uses less digits than its factorization.

660404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654 (or 1652 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 660404 is about 812.6524472368. The cubic root of 660404 is about 87.0836382449.

The spelling of 660404 in words is "six hundred sixty thousand, four hundred four".