688801892 has 6 divisors (see below), whose sum is σ = 1205403318. Its totient is φ = 344400944.

The previous prime is 688801877. The next prime is 688801901. The reversal of 688801892 is 298108886.

It can be written as a sum of positive squares in only one way, i.e., 619312996 + 69488896 = 24886^2 + 8336^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 688801892.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86100233 + ... + 86100240.

It is an arithmetic number, because the mean of its divisors is an integer number (200900553).

Almost surely, 2^688801892 is an apocalyptic number.

It is an amenable number.

688801892 is a deficient number, since it is larger than the sum of its proper divisors (516601426).

688801892 is a wasteful number, since it uses less digits than its factorization.

688801892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172200477 (or 172200475 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 50.

The square root of 688801892 is about 26245.0355686556. The cubic root of 688801892 is about 883.1438394838.

The spelling of 688801892 in words is "six hundred eighty-eight million, eight hundred one thousand, eight hundred ninety-two".