686221674 has 64 divisors (see below), whose sum is σ = 1443536640. Its totient is φ = 217280000.

The previous prime is 686221663. The next prime is 686221699. The reversal of 686221674 is 476122686.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1763872 + ... + 1764260.

It is an arithmetic number, because the mean of its divisors is an integer number (22555260).

Almost surely, 2^686221674 is an apocalyptic number.

686221674 is an abundant number, since it is smaller than the sum of its proper divisors (757314966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686221674 is a wasteful number, since it uses less digits than its factorization.

686221674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607.

The product of its digits is 193536, while the sum is 42.

The square root of 686221674 is about 26195.8331419331. The cubic root of 686221674 is about 882.0397218859.

The spelling of 686221674 in words is "six hundred eighty-six million, two hundred twenty-one thousand, six hundred seventy-four".