688387172 has 24 divisors (see below), whose sum is σ = 1344760032. Its totient is φ = 305625600.

The previous prime is 688387151. The next prime is 688387177. The reversal of 688387172 is 271783886.

It is a self number, because there is not a number n which added to its sum of digits gives 688387172.

It is not an unprimeable number, because it can be changed into a prime (688387177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180029 + ... + 183812.

It is an arithmetic number, because the mean of its divisors is an integer number (56031668).

Almost surely, 2^688387172 is an apocalyptic number.

It is an amenable number.

688387172 is a deficient number, since it is larger than the sum of its proper divisors (656372860).

688387172 is a wasteful number, since it uses less digits than its factorization.

688387172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363899 (or 363897 counting only the distinct ones).

The product of its digits is 903168, while the sum is 50.

The square root of 688387172 is about 26237.1334562296. The cubic root of 688387172 is about 882.9665601874.

The spelling of 688387172 in words is "six hundred eighty-eight million, three hundred eighty-seven thousand, one hundred seventy-two".