688531342 has 16 divisors (see below), whose sum is σ = 1044439200. Its totient is φ = 340394400.

The previous prime is 688531307. The next prime is 688531343. The reversal of 688531342 is 243135886.

It is a junction number, because it is equal to n+sod(n) for n = 688531295 and 688531304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688531343) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 183784 + ... + 187492.

It is an arithmetic number, because the mean of its divisors is an integer number (65277450).

Almost surely, 2^688531342 is an apocalyptic number.

688531342 is a deficient number, since it is larger than the sum of its proper divisors (355907858).

688531342 is a wasteful number, since it uses less digits than its factorization.

688531342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4731.

The product of its digits is 138240, while the sum is 40.

The square root of 688531342 is about 26239.8807543022. The cubic root of 688531342 is about 883.0281962398.

The spelling of 688531342 in words is "six hundred eighty-eight million, five hundred thirty-one thousand, three hundred forty-two".