66879994 has 8 divisors (see below), whose sum is σ = 100554048. Its totient is φ = 33361980.

The previous prime is 66879977. The next prime is 66879997. The reversal of 66879994 is 49997866.

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 (66879997) 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, 37932 + ... + 39655.

It is an arithmetic number, because the mean of its divisors is an integer number (12569256).

Almost surely, 2^66879994 is an apocalyptic number.

66879994 is a deficient number, since it is larger than the sum of its proper divisors (33674054).

66879994 is a wasteful number, since it uses less digits than its factorization.

66879994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78020.

The product of its digits is 5878656, while the sum is 58.

The square root of 66879994 is about 8178.0189532673. The cubic root of 66879994 is about 405.9121725138.

The spelling of 66879994 in words is "sixty-six million, eight hundred seventy-nine thousand, nine hundred ninety-four".