688949799 has 16 divisors (see below), whose sum is σ = 942749184. Its totient is φ = 447372000.

The previous prime is 688949791. The next prime is 688949819. The reversal of 688949799 is 997949886.

It is not a de Polignac number, because 688949799 - 2³ = 688949791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688949791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574 + ... + 37124.

It is an arithmetic number, because the mean of its divisors is an integer number (58921824).

Almost surely, 2^688949799 is an apocalyptic number.

688949799 is a deficient number, since it is larger than the sum of its proper divisors (253799385).

688949799 is a wasteful number, since it uses less digits than its factorization.

688949799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36718.

The product of its digits is 70543872, while the sum is 69.

The square root of 688949799 is about 26247.8532265022. The cubic root of 688949799 is about 883.2070476954.

The spelling of 688949799 in words is "six hundred eighty-eight million, nine hundred forty-nine thousand, seven hundred ninety-nine".