688868886 has 16 divisors (see below), whose sum is σ = 1414974384. Its totient is φ = 223416864.

The previous prime is 688868881. The next prime is 688868899.

688868886 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688868881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1551285 + ... + 1551728.

It is an arithmetic number, because the mean of its divisors is an integer number (88435899).

Almost surely, 2^688868886 is an apocalyptic number.

688868886 is an abundant number, since it is smaller than the sum of its proper divisors (726105498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688868886 is a wasteful number, since it uses less digits than its factorization.

688868886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103055.

The product of its digits is 56623104, while the sum is 66.

The square root of 688868886 is about 26246.3118551922. The cubic root of 688868886 is about 883.1724705609.

The spelling of 688868886 in words is "six hundred eighty-eight million, eight hundred sixty-eight thousand, eight hundred eighty-six".