8043640408 has 16 divisors (see below), whose sum is σ = 15737557680. Its totient is φ = 3846958368.

The previous prime is 8043640403. The next prime is 8043640427. The reversal of 8043640408 is 8040463408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8043640403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21857535 + ... + 21857902.

It is an arithmetic number, because the mean of its divisors is an integer number (983597355).

Almost surely, 2^8043640408 is an apocalyptic number.

It is an amenable number.

8043640408 is a deficient number, since it is larger than the sum of its proper divisors (7693917272).

8043640408 is a wasteful number, since it uses less digits than its factorization.

8043640408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43715466 (or 43715462 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 8043640408 is about 89686.3446016170. The cubic root of 8043640408 is about 2003.6301078388.

The spelling of 8043640408 in words is "eight billion, forty-three million, six hundred forty thousand, four hundred eight".