688040804 has 12 divisors (see below), whose sum is σ = 1313532528. Its totient is φ = 312745800.

The previous prime is 688040761. The next prime is 688040839. The reversal of 688040804 is 408040886.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7818602 + ... + 7818689.

It is an arithmetic number, because the mean of its divisors is an integer number (109461044).

Almost surely, 2^688040804 is an apocalyptic number.

It is an amenable number.

688040804 is a deficient number, since it is larger than the sum of its proper divisors (625491724).

688040804 is a wasteful number, since it uses less digits than its factorization.

688040804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15637306 (or 15637304 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The square root of 688040804 is about 26230.5319046336. The cubic root of 688040804 is about 882.8184445716.

The spelling of 688040804 in words is "six hundred eighty-eight million, forty thousand, eight hundred four".