667678442 has 8 divisors (see below), whose sum is σ = 1009163232. Its totient is φ = 331290700.

The previous prime is 667678423. The next prime is 667678447. The reversal of 667678442 is 244876766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (667678447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1273934 + ... + 1274457.

It is an arithmetic number, because the mean of its divisors is an integer number (126145404).

Almost surely, 2^667678442 is an apocalyptic number.

667678442 is a deficient number, since it is larger than the sum of its proper divisors (341484790).

667678442 is a wasteful number, since it uses less digits than its factorization.

667678442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548524.

The product of its digits is 2709504, while the sum is 50.

The square root of 667678442 is about 25839.4744915604. The cubic root of 667678442 is about 874.0221749388.

The spelling of 667678442 in words is "six hundred sixty-seven million, six hundred seventy-eight thousand, four hundred forty-two".