688350397 has 4 divisors (see below), whose sum is σ = 786686176. Its totient is φ = 590014620.

The previous prime is 688350343. The next prime is 688350401. The reversal of 688350397 is 793053886.

688350397 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 793053886 = 2 ⋅396526943.

It is a cyclic number.

It is not a de Polignac number, because 688350397 - 2¹⁵ = 688317629 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 688350397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688350317) 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, 49167879 + ... + 49167892.

It is an arithmetic number, because the mean of its divisors is an integer number (196671544).

Almost surely, 2^688350397 is an apocalyptic number.

It is an amenable number.

688350397 is a deficient number, since it is larger than the sum of its proper divisors (98335779).

688350397 is an equidigital number, since it uses as much as digits as its factorization.

688350397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98335778.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 688350397 is about 26236.4326271694. The cubic root of 688350397 is about 882.9508366359.

The spelling of 688350397 in words is "six hundred eighty-eight million, three hundred fifty thousand, three hundred ninety-seven".