667028 has 12 divisors (see below), whose sum is σ = 1179360. Its totient is φ = 330072.

The previous prime is 667021. The next prime is 667081. The reversal of 667028 is 820766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667021) by changing a digit.

667028 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 in 3 ways as a sum of consecutive naturals, for example, 398 + ... + 1221.

It is an arithmetic number, because the mean of its divisors is an integer number (98280).

2⁶⁶⁷⁰²⁸ is an apocalyptic number.

It is an amenable number.

667028 is a deficient number, since it is larger than the sum of its proper divisors (512332).

667028 is a wasteful number, since it uses less digits than its factorization.

667028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726 (or 1724 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 667028 is about 816.7178215271. The cubic root of 667028 is about 87.3738263101.

The spelling of 667028 in words is "six hundred sixty-seven thousand, twenty-eight".