688346331 has 4 divisors (see below), whose sum is σ = 917795112. Its totient is φ = 458897552.

The previous prime is 688346297. The next prime is 688346339. The reversal of 688346331 is 133643886.

688346331 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 688346331 - 2¹⁷ = 688215259 is a prime.

It is a super-2 number, since 2×688346331² = 947641342802323122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (688346339) 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, 114724386 + ... + 114724391.

It is an arithmetic number, because the mean of its divisors is an integer number (229448778).

Almost surely, 2^688346331 is an apocalyptic number.

688346331 is a deficient number, since it is larger than the sum of its proper divisors (229448781).

688346331 is a wasteful number, since it uses less digits than its factorization.

688346331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229448780.

The product of its digits is 248832, while the sum is 42.

The square root of 688346331 is about 26236.3551393863. The cubic root of 688346331 is about 882.9490981389.

The spelling of 688346331 in words is "six hundred eighty-eight million, three hundred forty-six thousand, three hundred thirty-one".