688647234 has 32 divisors (see below), whose sum is σ = 1539155520. Its totient is φ = 203590400.

The previous prime is 688647139. The next prime is 688647257. The reversal of 688647234 is 432746886.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124539 + ... + 129950.

It is an arithmetic number, because the mean of its divisors is an integer number (48098610).

Almost surely, 2^688647234 is an apocalyptic number.

688647234 is an abundant number, since it is smaller than the sum of its proper divisors (850508286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688647234 is a wasteful number, since it uses less digits than its factorization.

688647234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254546.

The product of its digits is 1548288, while the sum is 48.

The square root of 688647234 is about 26242.0889793477. The cubic root of 688647234 is about 883.0777365470.

The spelling of 688647234 in words is "six hundred eighty-eight million, six hundred forty-seven thousand, two hundred thirty-four".