664828 has 6 divisors (see below), whose sum is σ = 1163456. Its totient is φ = 332412.

The previous prime is 664799. The next prime is 664843. The reversal of 664828 is 828466.

664828 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 664793 and 664802.

It is a congruent number.

It is an unprimeable number.

664828 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 as a sum of consecutive naturals, namely, 83100 + ... + 83107.

2⁶⁶⁴⁸²⁸ is an apocalyptic number.

It is an amenable number.

664828 is a deficient number, since it is larger than the sum of its proper divisors (498628).

664828 is a wasteful number, since it uses less digits than its factorization.

664828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166211 (or 166209 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 664828 is about 815.3698547285. The cubic root of 664828 is about 87.2776613635.

The spelling of 664828 in words is "six hundred sixty-four thousand, eight hundred twenty-eight".