667279394 has 4 divisors (see below), whose sum is σ = 1000919094. Its totient is φ = 333639696.

The previous prime is 667279363. The next prime is 667279399. The reversal of 667279394 is 493972766.

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

It can be written as a sum of positive squares in only one way, i.e., 627753025 + 39526369 = 25055^2 + 6287^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667279399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166819847 + ... + 166819850.

Almost surely, 2^667279394 is an apocalyptic number.

667279394 is a deficient number, since it is larger than the sum of its proper divisors (333639700).

667279394 is a wasteful number, since it uses less digits than its factorization.

667279394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333639699.

The product of its digits is 3429216, while the sum is 53.

The square root of 667279394 is about 25831.7516634083. The cubic root of 667279394 is about 873.8480160993.

The spelling of 667279394 in words is "six hundred sixty-seven million, two hundred seventy-nine thousand, three hundred ninety-four".