689428908 has 144 divisors (see below), whose sum is σ = 2174565120. Its totient is φ = 186577344.

The previous prime is 689428907. The next prime is 689428913. The reversal of 689428908 is 809824986.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (689428907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 126610 + ... + 131942.

Almost surely, 2^689428908 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 689428908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087282560).

689428908 is an abundant number, since it is smaller than the sum of its proper divisors (1485136212).

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

689428908 is a wasteful number, since it uses less digits than its factorization.

689428908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378 (or 5364 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The square root of 689428908 is about 26256.9782724517. The cubic root of 689428908 is about 883.4117333365.

The spelling of 689428908 in words is "six hundred eighty-nine million, four hundred twenty-eight thousand, nine hundred eight".