688864418 has 16 divisors (see below), whose sum is σ = 1186561440. Its totient is φ = 296640000.

The previous prime is 688864391. The next prime is 688864433. The reversal of 688864418 is 814468886.

It is a self number, because there is not a number n which added to its sum of digits gives 688864418.

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, 823583 + ... + 824418.

It is an arithmetic number, because the mean of its divisors is an integer number (74160090).

Almost surely, 2^688864418 is an apocalyptic number.

688864418 is a deficient number, since it is larger than the sum of its proper divisors (497697022).

688864418 is a wasteful number, since it uses less digits than its factorization.

688864418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648033.

The product of its digits is 2359296, while the sum is 53.

The square root of 688864418 is about 26246.2267383333. The cubic root of 688864418 is about 883.1705611394.

The spelling of 688864418 in words is "six hundred eighty-eight million, eight hundred sixty-four thousand, four hundred eighteen".