8304640640 has 64 divisors (see below), whose sum is σ = 19941089760. Its totient is φ = 3307164672.

The previous prime is 8304640609. The next prime is 8304640667. The reversal of 8304640640 is 460464038.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 8304640640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116699 + ... + 173861.

Almost surely, 2^8304640640 is an apocalyptic number.

8304640640 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 8304640640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9970544880).

8304640640 is an abundant number, since it is smaller than the sum of its proper divisors (11636449120).

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

8304640640 is a wasteful number, since it uses less digits than its factorization.

8304640640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57409 (or 57397 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 8304640640 is about 91129.8010532230. The cubic root of 8304640640 is about 2025.0711260899.

The spelling of 8304640640 in words is "eight billion, three hundred four million, six hundred forty thousand, six hundred forty".