689478912 has 144 divisors (see below), whose sum is σ = 2128049280. Its totient is φ = 219783168.

The previous prime is 689478893. The next prime is 689478917. The reversal of 689478912 is 219874986.

689478912 is a `hidden beast` number, since 6 + 89 + 478 + 91 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689478917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156808 + ... + 161144.

It is an arithmetic number, because the mean of its divisors is an integer number (14778120).

Almost surely, 2^689478912 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 689478912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1064024640).

689478912 is an abundant number, since it is smaller than the sum of its proper divisors (1438570368).

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

689478912 is a wasteful number, since it uses less digits than its factorization.

689478912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385 (or 4365 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 689478912 is about 26257.9304591965. The cubic root of 689478912 is about 883.4330906521.

The spelling of 689478912 in words is "six hundred eighty-nine million, four hundred seventy-eight thousand, nine hundred twelve".