688495 has 4 divisors (see below), whose sum is σ = 826200. Its totient is φ = 550792.

The previous prime is 688477. The next prime is 688511. The reversal of 688495 is 594886.

688495 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 688495 - 2¹⁵ = 655727 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68845 + ... + 68854.

It is an arithmetic number, because the mean of its divisors is an integer number (206550).

2⁶⁸⁸⁴⁹⁵ is an apocalyptic number.

688495 is a deficient number, since it is larger than the sum of its proper divisors (137705).

688495 is a wasteful number, since it uses less digits than its factorization.

688495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137704.

The product of its digits is 69120, while the sum is 40.

The square root of 688495 is about 829.7559882279. The cubic root of 688495 is about 88.3012659995.

The spelling of 688495 in words is "six hundred eighty-eight thousand, four hundred ninety-five".