667713878 has 16 divisors (see below), whose sum is σ = 1079126496. Its totient is φ = 308029440.

The previous prime is 667713859. The next prime is 667713881. The reversal of 667713878 is 878317766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65750 + ... + 75222.

It is an arithmetic number, because the mean of its divisors is an integer number (67445406).

Almost surely, 2^667713878 is an apocalyptic number.

667713878 is a deficient number, since it is larger than the sum of its proper divisors (411412618).

667713878 is a wasteful number, since it uses less digits than its factorization.

667713878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12199.

The product of its digits is 2370816, while the sum is 53.

The square root of 667713878 is about 25840.1601775221. The cubic root of 667713878 is about 874.0376371234.

The spelling of 667713878 in words is "six hundred sixty-seven million, seven hundred thirteen thousand, eight hundred seventy-eight".