686674775 has 24 divisors (see below), whose sum is σ = 893942784. Its totient is φ = 522236000.

The previous prime is 686674771. The next prime is 686674787. The reversal of 686674775 is 577476686.

It is not a de Polignac number, because 686674775 - 2² = 686674771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686674775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686674771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92450 + ... + 99600.

It is an arithmetic number, because the mean of its divisors is an integer number (37247616).

Almost surely, 2^686674775 is an apocalyptic number.

686674775 is a deficient number, since it is larger than the sum of its proper divisors (207268009).

686674775 is a wasteful number, since it uses less digits than its factorization.

686674775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7351 (or 7346 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 56.

The square root of 686674775 is about 26204.4800558988. The cubic root of 686674775 is about 882.2338113305.

The spelling of 686674775 in words is "six hundred eighty-six million, six hundred seventy-four thousand, seven hundred seventy-five".