686451812 has 6 divisors (see below), whose sum is σ = 1201290678. Its totient is φ = 343225904.

The previous prime is 686451803. The next prime is 686451839. The reversal of 686451812 is 218154686.

It can be written as a sum of positive squares in only one way, i.e., 473758756 + 212693056 = 21766^2 + 14584^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 686451812.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85806473 + ... + 85806480.

It is an arithmetic number, because the mean of its divisors is an integer number (200215113).

Almost surely, 2^686451812 is an apocalyptic number.

It is an amenable number.

686451812 is a deficient number, since it is larger than the sum of its proper divisors (514838866).

686451812 is a wasteful number, since it uses less digits than its factorization.

686451812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171612957 (or 171612955 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 686451812 is about 26200.2254188776. The cubic root of 686451812 is about 882.1383140158.

The spelling of 686451812 in words is "six hundred eighty-six million, four hundred fifty-one thousand, eight hundred twelve".