688343421 has 8 divisors (see below), whose sum is σ = 923637664. Its totient is φ = 455972400.

The previous prime is 688343399. The next prime is 688343423. The reversal of 688343421 is 124343886.

It is a happy number.

688343421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 688343421 - 2⁹ = 688342909 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 688343421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688343423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730255 + ... + 731196.

It is an arithmetic number, because the mean of its divisors is an integer number (115454708).

Almost surely, 2^688343421 is an apocalyptic number.

It is an amenable number.

688343421 is a deficient number, since it is larger than the sum of its proper divisors (235294243).

688343421 is a wasteful number, since it uses less digits than its factorization.

688343421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461611.

The product of its digits is 110592, while the sum is 39.

The square root of 688343421 is about 26236.2996819292. The cubic root of 688343421 is about 882.9478539080.

The spelling of 688343421 in words is "six hundred eighty-eight million, three hundred forty-three thousand, four hundred twenty-one".