686857228 has 24 divisors (see below), whose sum is σ = 1244905200. Its totient is φ = 331197888.

The previous prime is 686857217. The next prime is 686857247. The reversal of 686857228 is 822758686.

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, 112683 + ... + 118621.

It is an arithmetic number, because the mean of its divisors is an integer number (51871050).

Almost surely, 2^686857228 is an apocalyptic number.

It is an amenable number.

686857228 is a deficient number, since it is larger than the sum of its proper divisors (558047972).

686857228 is a wasteful number, since it uses less digits than its factorization.

686857228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6969 (or 6967 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 52.

The square root of 686857228 is about 26207.9611568699. The cubic root of 686857228 is about 882.3119424230.

The spelling of 686857228 in words is "six hundred eighty-six million, eight hundred fifty-seven thousand, two hundred twenty-eight".