688561995 has 96 divisors (see below), whose sum is σ = 1308464640. Its totient is φ = 307929600.

The previous prime is 688561981. The next prime is 688562057. The reversal of 688561995 is 599165886.

688561995 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 688561995 - 2⁹ = 688561483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1413642 + ... + 1414128.

It is an arithmetic number, because the mean of its divisors is an integer number (13629840).

Almost surely, 2^688561995 is an apocalyptic number.

688561995 is a deficient number, since it is larger than the sum of its proper divisors (619902645).

688561995 is a wasteful number, since it uses less digits than its factorization.

688561995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 566 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 57.

The square root of 688561995 is about 26240.4648396327. The cubic root of 688561995 is about 883.0413000062.

The spelling of 688561995 in words is "six hundred eighty-eight million, five hundred sixty-one thousand, nine hundred ninety-five".