686878678 has 16 divisors (see below), whose sum is σ = 1036110240. Its totient is φ = 341513856.

The previous prime is 686878667. The next prime is 686878721. The reversal of 686878678 is 876878686.

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, 460558 + ... + 462046.

It is an arithmetic number, because the mean of its divisors is an integer number (64756890).

Almost surely, 2^686878678 is an apocalyptic number.

686878678 is a deficient number, since it is larger than the sum of its proper divisors (349231562).

686878678 is a wasteful number, since it uses less digits than its factorization.

686878678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631.

The product of its digits is 43352064, while the sum is 64.

The square root of 686878678 is about 26208.3703804720. The cubic root of 686878678 is about 882.3211269587.

The spelling of 686878678 in words is "six hundred eighty-six million, eight hundred seventy-eight thousand, six hundred seventy-eight".