688904107 has 4 divisors (see below), whose sum is σ = 729427896. Its totient is φ = 648380320.

The previous prime is 688904093. The next prime is 688904137. The reversal of 688904107 is 701409886.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688904107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688904137) 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, 20261869 + ... + 20261902.

It is an arithmetic number, because the mean of its divisors is an integer number (182356974).

Almost surely, 2^688904107 is an apocalyptic number.

688904107 is a deficient number, since it is larger than the sum of its proper divisors (40523789).

688904107 is a wasteful number, since it uses less digits than its factorization.

688904107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40523788.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 688904107 is about 26246.9828170782. The cubic root of 688904107 is about 883.1875221370.

The spelling of 688904107 in words is "six hundred eighty-eight million, nine hundred four thousand, one hundred seven".