689720832 has 100 divisors (see below), whose sum is σ = 2058758856. Its totient is φ = 229893120.

The previous prime is 689720807. The next prime is 689720861. The reversal of 689720832 is 238027986.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33157 + ... + 49787.

Almost surely, 2^689720832 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 689720832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1029379428).

689720832 is an abundant number, since it is smaller than the sum of its proper divisors (1369038024).

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

689720832 is an equidigital number, since it uses as much as digits as its factorization.

689720832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16661 (or 16636 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 689720832 is about 26262.5366634680. The cubic root of 689720832 is about 883.5364030417.

The spelling of 689720832 in words is "six hundred eighty-nine million, seven hundred twenty thousand, eight hundred thirty-two".