664854 has 16 divisors (see below), whose sum is σ = 1375920. Its totient is φ = 213920.

The previous prime is 664849. The next prime is 664879. The reversal of 664854 is 458466.

664854 = 118² + 119² + ... + 153².

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1737 + ... + 2084.

It is an arithmetic number, because the mean of its divisors is an integer number (85995).

2⁶⁶⁴⁸⁵⁴ is an apocalyptic number.

664854 is an abundant number, since it is smaller than the sum of its proper divisors (711066).

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

664854 is a wasteful number, since it uses less digits than its factorization.

664854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855.

The product of its digits is 23040, while the sum is 33.

The square root of 664854 is about 815.3857982575. The cubic root of 664854 is about 87.2787990962.

The spelling of 664854 in words is "six hundred sixty-four thousand, eight hundred fifty-four".