667911128 has 8 divisors (see below), whose sum is σ = 1252333380. Its totient is φ = 333955560.

The previous prime is 667911119. The next prime is 667911149. The reversal of 667911128 is 821119766.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×667911128² = 892210549812464768, which contains 22 as substring.

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, 41744438 + ... + 41744453.

Almost surely, 2^667911128 is an apocalyptic number.

It is an amenable number.

667911128 is a deficient number, since it is larger than the sum of its proper divisors (584422252).

667911128 is a wasteful number, since it uses less digits than its factorization.

667911128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83488897 (or 83488893 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 667911128 is about 25843.9766289942. The cubic root of 667911128 is about 874.1236954166.

The spelling of 667911128 in words is "six hundred sixty-seven million, nine hundred eleven thousand, one hundred twenty-eight".