688776693 has 16 divisors (see below), whose sum is σ = 1034176512. Its totient is φ = 403974000.

The previous prime is 688776691. The next prime is 688776701. The reversal of 688776693 is 396677886.

It is not a de Polignac number, because 688776693 - 2¹ = 688776691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688776691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335623 + ... + 337668.

It is an arithmetic number, because the mean of its divisors is an integer number (64636032).

Almost surely, 2^688776693 is an apocalyptic number.

It is an amenable number.

688776693 is a deficient number, since it is larger than the sum of its proper divisors (345399819).

688776693 is a wasteful number, since it uses less digits than its factorization.

688776693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673336.

The product of its digits is 18289152, while the sum is 60.

The square root of 688776693 is about 26244.5554925207. Note that the first 3 decimals coincide. The cubic root of 688776693 is about 883.1330697626.

The spelling of 688776693 in words is "six hundred eighty-eight million, seven hundred seventy-six thousand, six hundred ninety-three".