688576913 has 4 divisors (see below), whose sum is σ = 694670628. Its totient is φ = 682483200.

The previous prime is 688576909. The next prime is 688576937. The reversal of 688576913 is 319675886.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319675886 = 2 ⋅159837943.

It can be written as a sum of positive squares in 2 ways, for example, as 3341584 + 685235329 = 1828^2 + 26177^2 .

It is a cyclic number.

It is not a de Polignac number, because 688576913 - 2² = 688576909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688576963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3046688 + ... + 3046913.

It is an arithmetic number, because the mean of its divisors is an integer number (173667657).

Almost surely, 2^688576913 is an apocalyptic number.

It is an amenable number.

688576913 is a deficient number, since it is larger than the sum of its proper divisors (6093715).

688576913 is a wasteful number, since it uses less digits than its factorization.

688576913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6093714.

The product of its digits is 2177280, while the sum is 53.

The square root of 688576913 is about 26240.7490937283. The cubic root of 688576913 is about 883.0476771202.

The spelling of 688576913 in words is "six hundred eighty-eight million, five hundred seventy-six thousand, nine hundred thirteen".