667672406 has 4 divisors (see below), whose sum is σ = 1001508612. Its totient is φ = 333836202.

The previous prime is 667672373. The next prime is 667672469. The reversal of 667672406 is 604276766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166918100 + ... + 166918103.

It is an arithmetic number, because the mean of its divisors is an integer number (250377153).

Almost surely, 2^667672406 is an apocalyptic number.

667672406 is a deficient number, since it is larger than the sum of its proper divisors (333836206).

667672406 is a wasteful number, since it uses less digits than its factorization.

667672406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333836205.

The product of its (nonzero) digits is 508032, while the sum is 44.

The square root of 667672406 is about 25839.3576932555. The cubic root of 667672406 is about 874.0195411292.

The spelling of 667672406 in words is "six hundred sixty-seven million, six hundred seventy-two thousand, four hundred six".