665828 has 6 divisors (see below), whose sum is σ = 1165206. Its totient is φ = 332912.

The previous prime is 665813. The next prime is 665843. The reversal of 665828 is 828566.

It is an interprime number because it is at equal distance from previous prime (665813) and next prime (665843).

It can be written as a sum of positive squares in only one way, i.e., 465124 + 200704 = 682^2 + 448^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665828.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83225 + ... + 83232.

It is an arithmetic number, because the mean of its divisors is an integer number (194201).

2⁶⁶⁵⁸²⁸ is an apocalyptic number.

It is an amenable number.

665828 is a deficient number, since it is larger than the sum of its proper divisors (499378).

665828 is a wasteful number, since it uses less digits than its factorization.

665828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166461 (or 166459 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 665828 is about 815.9828429569. The cubic root of 665828 is about 87.3213989610.

The spelling of 665828 in words is "six hundred sixty-five thousand, eight hundred twenty-eight".