688536403 has 4 divisors (see below), whose sum is σ = 689105248. Its totient is φ = 687967560.

The previous prime is 688536391. The next prime is 688536413. The reversal of 688536403 is 304635886.

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 688536403 - 2⁹ = 688535891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 688536403.

It is not an unprimeable number, because it can be changed into a prime (688536413) 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, 282603 + ... + 285028.

It is an arithmetic number, because the mean of its divisors is an integer number (172276312).

Almost surely, 2^688536403 is an apocalyptic number.

688536403 is a deficient number, since it is larger than the sum of its proper divisors (568845).

688536403 is a wasteful number, since it uses less digits than its factorization.

688536403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568844.

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 688536403 is about 26239.9771913011. The cubic root of 688536403 is about 883.0303597795.

The spelling of 688536403 in words is "six hundred eighty-eight million, five hundred thirty-six thousand, four hundred three".