8644640904 has 144 divisors (see below), whose sum is σ = 24451453260. Its totient is φ = 2758752000.

The previous prime is 8644640887. The next prime is 8644640929. The reversal of 8644640904 is 4090464468.

8644640904 is a `hidden beast` number, since 86 + 446 + 40 + 90 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7162236900 + 1482404004 = 84630^2 + 38502^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8644640904.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6987774 + ... + 6989010.

Almost surely, 2^8644640904 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 8644640904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12225726630).

8644640904 is an abundant number, since it is smaller than the sum of its proper divisors (15806812356).

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

8644640904 is a wasteful number, since it uses less digits than its factorization.

8644640904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412 (or 1374 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The square root of 8644640904 is about 92976.5610463196. The cubic root of 8644640904 is about 2052.3384699817.

The spelling of 8644640904 in words is "eight billion, six hundred forty-four million, six hundred forty thousand, nine hundred four".