667662879 has 32 divisors (see below), whose sum is σ = 1021132224. Its totient is φ = 384399360.

The previous prime is 667662797. The next prime is 667662881. The reversal of 667662879 is 978266766.

It is a happy number.

It is not a de Polignac number, because 667662879 - 2⁸ = 667662623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667662179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111789 + ... + 117609.

It is an arithmetic number, because the mean of its divisors is an integer number (31910382).

Almost surely, 2^667662879 is an apocalyptic number.

667662879 is a deficient number, since it is larger than the sum of its proper divisors (353469345).

667662879 is a wasteful number, since it uses less digits than its factorization.

667662879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6027.

The product of its digits is 9144576, while the sum is 57.

The square root of 667662879 is about 25839.1733420402. The cubic root of 667662879 is about 874.0153839888.

The spelling of 667662879 in words is "six hundred sixty-seven million, six hundred sixty-two thousand, eight hundred seventy-nine".