688106881 has 16 divisors (see below), whose sum is σ = 858866688. Its totient is φ = 535582800.

The previous prime is 688106879. The next prime is 688106921. The reversal of 688106881 is 188601886.

It is a cyclic number.

It is not a de Polignac number, because 688106881 - 2¹ = 688106879 is a prime.

It is a super-2 number, since 2×688106881² = 946982159359096322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688106581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71146 + ... + 80236.

It is an arithmetic number, because the mean of its divisors is an integer number (53679168).

Almost surely, 2^688106881 is an apocalyptic number.

It is an amenable number.

688106881 is a deficient number, since it is larger than the sum of its proper divisors (170759807).

688106881 is a wasteful number, since it uses less digits than its factorization.

688106881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10092.

The product of its (nonzero) digits is 147456, while the sum is 46.

The square root of 688106881 is about 26231.7914180484. The cubic root of 688106881 is about 882.8467045850.

The spelling of 688106881 in words is "six hundred eighty-eight million, one hundred six thousand, eight hundred eighty-one".