8689443840 has 1056 divisors, whose sum is σ = 39239516160. Its totient is φ = 1725235200.

The previous prime is 8689443811. The next prime is 8689443857. The reversal of 8689443840 is 483449868.

8689443840 is a `hidden beast` number, since 86 + 8 + 94 + 438 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (1056).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 109992921 + ... + 109992999.

Almost surely, 2^8689443840 is an apocalyptic number.

8689443840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8689443840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19619758080).

8689443840 is an abundant number, since it is smaller than the sum of its proper divisors (30550072320).

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

8689443840 is a wasteful number, since it uses less digits than its factorization.

8689443840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 54.

The square root of 8689443840 is about 93217.1863982174. The cubic root of 8689443840 is about 2055.8779419533.

The spelling of 8689443840 in words is "eight billion, six hundred eighty-nine million, four hundred forty-three thousand, eight hundred forty".