686886879 has 16 divisors (see below), whose sum is σ = 1101774080. Its totient is φ = 371848320.

The previous prime is 686886877. The next prime is 686886883. The reversal of 686886879 is 978688686.

It is not a de Polignac number, because 686886879 - 2¹ = 686886877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686886877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 860362 + ... + 861159.

It is an arithmetic number, because the mean of its divisors is an integer number (68860880).

Almost surely, 2^686886879 is an apocalyptic number.

686886879 is a deficient number, since it is larger than the sum of its proper divisors (414887201).

686886879 is a wasteful number, since it uses less digits than its factorization.

686886879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721550.

The product of its digits is 55738368, while the sum is 66.

The square root of 686886879 is about 26208.5268376534. The cubic root of 686886879 is about 882.3246384409.

The spelling of 686886879 in words is "six hundred eighty-six million, eight hundred eighty-six thousand, eight hundred seventy-nine".