688899911 has 4 divisors (see below), whose sum is σ = 787314192. Its totient is φ = 590485632.

The previous prime is 688899889. The next prime is 688899971. The reversal of 688899911 is 119998886.

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

It is a cyclic number.

It is not a de Polignac number, because 688899911 - 2⁶ = 688899847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688899971) 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, 49207130 + ... + 49207143.

It is an arithmetic number, because the mean of its divisors is an integer number (196828548).

Almost surely, 2^688899911 is an apocalyptic number.

688899911 is a deficient number, since it is larger than the sum of its proper divisors (98414281).

688899911 is an equidigital number, since it uses as much as digits as its factorization.

688899911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98414280.

The product of its digits is 2239488, while the sum is 59.

The square root of 688899911 is about 26246.9028839595. The cubic root of 688899911 is about 883.1857290174.

The spelling of 688899911 in words is "six hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred eleven".