688626311 has 4 divisors (see below), whose sum is σ = 688681224. Its totient is φ = 688571400.

The previous prime is 688626299. The next prime is 688626317. The reversal of 688626311 is 113626886.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 688626311 - 2¹⁴ = 688609927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688626317) 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, 1616 + ... + 37146.

It is an arithmetic number, because the mean of its divisors is an integer number (172170306).

Almost surely, 2^688626311 is an apocalyptic number.

688626311 is a deficient number, since it is larger than the sum of its proper divisors (54913).

688626311 is a wasteful number, since it uses less digits than its factorization.

688626311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54912.

The product of its digits is 82944, while the sum is 41.

The square root of 688626311 is about 26241.6903228432. The cubic root of 688626311 is about 883.0687930116.

The spelling of 688626311 in words is "six hundred eighty-eight million, six hundred twenty-six thousand, three hundred eleven".