689232040 has 72 divisors (see below), whose sum is σ = 1807006590. Its totient is φ = 235909632.

The previous prime is 689231999. The next prime is 689232043. The reversal of 689232040 is 40232986.

It can be written as a sum of positive squares in 3 ways, for example, as 609201124 + 80030916 = 24682^2 + 8946^2 .

It is a junction number, because it is equal to n+sod(n) for n = 689231987 and 689232005.

It is not an unprimeable number, because it can be changed into a prime (689232043) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1161984 + ... + 1162576.

Almost surely, 2^689232040 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 689232040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903503295).

689232040 is an abundant number, since it is smaller than the sum of its proper divisors (1117774550).

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

689232040 is an equidigital number, since it uses as much as digits as its factorization.

689232040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 689232040 is about 26253.2291347179. The cubic root of 689232040 is about 883.3276385852.

The spelling of 689232040 in words is "six hundred eighty-nine million, two hundred thirty-two thousand, forty".