688351 has 4 divisors (see below), whose sum is σ = 724600. Its totient is φ = 652104.

The previous prime is 688339. The next prime is 688357. The reversal of 688351 is 153886.

688351 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, and also an emirpimes, since its reverse is a distinct semiprime: 153886 = 2 ⋅76943.

It is a cyclic number.

It is not a de Polignac number, because 688351 - 2⁷ = 688223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688357) 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, 18096 + ... + 18133.

It is an arithmetic number, because the mean of its divisors is an integer number (181150).

2⁶⁸⁸³⁵¹ is an apocalyptic number.

688351 is a deficient number, since it is larger than the sum of its proper divisors (36249).

688351 is a wasteful number, since it uses less digits than its factorization.

688351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36248.

The product of its digits is 5760, while the sum is 31.

The square root of 688351 is about 829.6692111920. The cubic root of 688351 is about 88.2951094460.

The spelling of 688351 in words is "six hundred eighty-eight thousand, three hundred fifty-one".