688104841 has 4 divisors (see below), whose sum is σ = 690589252. Its totient is φ = 685620432.

The previous prime is 688104821. The next prime is 688104853. The reversal of 688104841 is 148401886.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126225225 + 561879616 = 11235^2 + 23704^2 .

It is a cyclic number.

It is not a de Polignac number, because 688104841 - 2¹³ = 688096649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688104794 and 688104803.

It is not an unprimeable number, because it can be changed into a prime (688104821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1241790 + ... + 1242343.

It is an arithmetic number, because the mean of its divisors is an integer number (172647313).

Almost surely, 2^688104841 is an apocalyptic number.

It is an amenable number.

688104841 is a deficient number, since it is larger than the sum of its proper divisors (2484411).

688104841 is a wasteful number, since it uses less digits than its factorization.

688104841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484410.

The product of its (nonzero) digits is 49152, while the sum is 40.

The square root of 688104841 is about 26231.7525339044. The cubic root of 688104841 is about 882.8458321386.

The spelling of 688104841 in words is "six hundred eighty-eight million, one hundred four thousand, eight hundred forty-one".