667406404 has 12 divisors (see below), whose sum is σ = 1334812864. Its totient is φ = 286031304.

The previous prime is 667406357. The next prime is 667406413. The reversal of 667406404 is 404604766.

667406404 is an admirable number.

It is a super-2 number, since 2×667406404² = 890862616200422432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11917944 + ... + 11917999.

Almost surely, 2^667406404 is an apocalyptic number.

It is an amenable number.

667406404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667406404 is a wasteful number, since it uses less digits than its factorization.

667406404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23835954 (or 23835952 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The square root of 667406404 is about 25834.2099550189. The cubic root of 667406404 is about 873.9034553434.

The spelling of 667406404 in words is "six hundred sixty-seven million, four hundred six thousand, four hundred four".