5644861920 has 384 divisors, whose sum is σ = 20758671360. Its totient is φ = 1430784000.

The previous prime is 5644861909. The next prime is 5644861921. The reversal of 5644861920 is 291684465.

5644861920 is a `hidden beast` number, since 5 + 6 + 4 + 4 + 8 + 619 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5644861921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8168775 + ... + 8169465.

It is an arithmetic number, because the mean of its divisors is an integer number (54059040).

Almost surely, 2^5644861920 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 5644861920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10379335680).

5644861920 is an abundant number, since it is smaller than the sum of its proper divisors (15113809440).

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

5644861920 is a wasteful number, since it uses less digits than its factorization.

5644861920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 5644861920 is about 75132.2961182473. The cubic root of 5644861920 is about 1780.5374297741.

The spelling of 5644861920 in words is "five billion, six hundred forty-four million, eight hundred sixty-one thousand, nine hundred twenty".