688422288 has 80 divisors (see below), whose sum is σ = 1884800000. Its totient is φ = 215913600.

The previous prime is 688422281. The next prime is 688422311. The reversal of 688422288 is 882224886.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (688422281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135213 + ... + 140211.

It is an arithmetic number, because the mean of its divisors is an integer number (23560000).

Almost surely, 2^688422288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688422288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942400000).

688422288 is an abundant number, since it is smaller than the sum of its proper divisors (1196377712).

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

688422288 is a wasteful number, since it uses less digits than its factorization.

688422288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180 (or 5174 counting only the distinct ones).

The product of its digits is 786432, while the sum is 48.

The square root of 688422288 is about 26237.8026518990. The cubic root of 688422288 is about 882.9815738928.

The spelling of 688422288 in words is "six hundred eighty-eight million, four hundred twenty-two thousand, two hundred eighty-eight".