688244112 has 60 divisors (see below), whose sum is σ = 1939115100. Its totient is φ = 227867904.

The previous prime is 688244057. The next prime is 688244131. The reversal of 688244112 is 211442886.

It can be written as a sum of positive squares in 2 ways, for example, as 439992576 + 248251536 = 20976^2 + 15756^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5418 + ... + 37494.

It is an arithmetic number, because the mean of its divisors is an integer number (32318585).

Almost surely, 2^688244112 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 688244112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969557550).

688244112 is an abundant number, since it is smaller than the sum of its proper divisors (1250870988).

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

688244112 is a wasteful number, since it uses less digits than its factorization.

688244112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32240 (or 32231 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 688244112 is about 26234.4070258887. The cubic root of 688244112 is about 882.9053901789.

Adding to 688244112 its reverse (211442886), we get a palindrome (899686998).

The spelling of 688244112 in words is "six hundred eighty-eight million, two hundred forty-four thousand, one hundred twelve".