688020140 has 12 divisors (see below), whose sum is σ = 1444842336. Its totient is φ = 275208048.

The previous prime is 688020131. The next prime is 688020163. The reversal of 688020140 is 41020886.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17200484 + ... + 17200523.

It is an arithmetic number, because the mean of its divisors is an integer number (120403528).

Almost surely, 2^688020140 is an apocalyptic number.

It is an amenable number.

688020140 is an abundant number, since it is smaller than the sum of its proper divisors (756822196).

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

688020140 is a wasteful number, since it uses less digits than its factorization.

688020140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34401016 (or 34401014 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 688020140 is about 26230.1380095492. The cubic root of 688020140 is about 882.8096065575.

It can be divided in two parts, 68 and 8020140, that added together give a palindrome (8020208).

The spelling of 688020140 in words is "six hundred eighty-eight million, twenty thousand, one hundred forty".