688943232 has 80 divisors (see below), whose sum is σ = 2050314750. Its totient is φ = 229644288.

The previous prime is 688943221. The next prime is 688943239. The reversal of 688943232 is 232349886.

It can be written as a sum of positive squares in only one way, i.e., 397763136 + 291180096 = 19944^2 + 17064^2 .

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 (688943239) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 22857 + ... + 43592.

Almost surely, 2^688943232 is an apocalyptic number.

It is an amenable number.

688943232 is an abundant number, since it is smaller than the sum of its proper divisors (1361371518).

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

688943232 is an equidigital number, since it uses as much as digits as its factorization.

688943232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66475 (or 66454 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 688943232 is about 26247.7281302592. The cubic root of 688943232 is about 883.2042414730.

The spelling of 688943232 in words is "six hundred eighty-eight million, nine hundred forty-three thousand, two hundred thirty-two".