688508623 has 4 divisors (see below), whose sum is σ = 751100328. Its totient is φ = 625916920.

The previous prime is 688508609. The next prime is 688508627. The reversal of 688508623 is 326805886.

It is a happy number.

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 688508623 - 2⁵ = 688508591 is a prime.

It is a super-2 number, since 2×688508623² = 948088247890712258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688508627) 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, 31295836 + ... + 31295857.

It is an arithmetic number, because the mean of its divisors is an integer number (187775082).

Almost surely, 2^688508623 is an apocalyptic number.

688508623 is a deficient number, since it is larger than the sum of its proper divisors (62591705).

688508623 is a wasteful number, since it uses less digits than its factorization.

688508623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62591704.

The product of its (nonzero) digits is 552960, while the sum is 46.

The square root of 688508623 is about 26239.4478409893. The cubic root of 688508623 is about 883.0184839062.

The spelling of 688508623 in words is "six hundred eighty-eight million, five hundred eight thousand, six hundred twenty-three".