5643918640 has 80 divisors (see below), whose sum is σ = 13247152128. Its totient is φ = 2236160768.

The previous prime is 5643918613. The next prime is 5643918659. The reversal of 5643918640 is 468193465.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×5643918640² = 63707635229878899200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5116329 + ... + 5117431.

Almost surely, 2^5643918640 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 5643918640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6623576064).

5643918640 is an abundant number, since it is smaller than the sum of its proper divisors (7603233488).

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

5643918640 is a wasteful number, since it uses less digits than its factorization.

5643918640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666 (or 1660 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 5643918640 is about 75126.0183957595. The cubic root of 5643918640 is about 1780.4382458358.

The spelling of 5643918640 in words is "five billion, six hundred forty-three million, nine hundred eighteen thousand, six hundred forty".