688074140 has 48 divisors (see below), whose sum is σ = 1606321920. Its totient is φ = 245859840.

The previous prime is 688074137. The next prime is 688074161. The reversal of 688074140 is 41470886.

It is a junction number, because it is equal to n+sod(n) for n = 688074094 and 688074103.

It is a congruent 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, 34625 + ... + 50744.

It is an arithmetic number, because the mean of its divisors is an integer number (33465040).

Almost surely, 2^688074140 is an apocalyptic number.

It is an amenable number.

688074140 is an abundant number, since it is smaller than the sum of its proper divisors (918247780).

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

688074140 is a wasteful number, since it uses less digits than its factorization.

688074140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85422 (or 85420 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 688074140 is about 26231.1673396363. The cubic root of 688074140 is about 882.8327020401.

The spelling of 688074140 in words is "six hundred eighty-eight million, seventy-four thousand, one hundred forty".