688899999999 has 48 divisors (see below), whose sum is σ = 971158108032. Its totient is φ = 434304851904.

The previous prime is 688899999959. The next prime is 688900000007. The reversal of 688899999999 is 999999998886.

It is a Cunningham number, because it is equal to 830000²-1.

It is not a de Polignac number, because 688899999999 - 2¹³ = 688899991807 is a prime.

688899999999 is a modest number, since divided by 999999 gives 688899 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688899999959) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88806229 + ... + 88813985.

It is an arithmetic number, because the mean of its divisors is an integer number (20232460584).

Almost surely, 2^688899999999 is an apocalyptic number.

688899999999 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

688899999999 is a deficient number, since it is larger than the sum of its proper divisors (282258108033).

688899999999 is a wasteful number, since it uses less digits than its factorization.

688899999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8436 (or 8413 counting only the distinct ones).

The product of its digits is 132239526912, while the sum is 102.

The spelling of 688899999999 in words is "six hundred eighty-eight billion, eight hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".