667831028 has 6 divisors (see below), whose sum is σ = 1168704306. Its totient is φ = 333915512.

The previous prime is 667830997. The next prime is 667831039. The reversal of 667831028 is 820138766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 608510224 + 59320804 = 24668^2 + 7702^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83478875 + ... + 83478882.

It is an arithmetic number, because the mean of its divisors is an integer number (194784051).

Almost surely, 2^667831028 is an apocalyptic number.

It is an amenable number.

667831028 is a deficient number, since it is larger than the sum of its proper divisors (500873278).

667831028 is a wasteful number, since it uses less digits than its factorization.

667831028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166957761 (or 166957759 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 667831028 is about 25842.4268984165. The cubic root of 667831028 is about 874.0887505942.

The spelling of 667831028 in words is "six hundred sixty-seven million, eight hundred thirty-one thousand, twenty-eight".