667404394 has 32 divisors (see below), whose sum is σ = 1099740672. Its totient is φ = 302400000.

The previous prime is 667404389. The next prime is 667404407. The reversal of 667404394 is 493404766.

It is a self number, because there is not a number n which added to its sum of digits gives 667404394.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220894 + ... + 223894.

It is an arithmetic number, because the mean of its divisors is an integer number (34366896).

Almost surely, 2^667404394 is an apocalyptic number.

667404394 is a deficient number, since it is larger than the sum of its proper divisors (432336278).

667404394 is a wasteful number, since it uses less digits than its factorization.

667404394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262.

The product of its (nonzero) digits is 435456, while the sum is 43.

The square root of 667404394 is about 25834.1710530839. The cubic root of 667404394 is about 873.9025780430.

The spelling of 667404394 in words is "six hundred sixty-seven million, four hundred four thousand, three hundred ninety-four".