5721217920 has 640 divisors, whose sum is σ = 22748774400. Its totient is φ = 1358622720.

The previous prime is 5721217903. The next prime is 5721217921. The reversal of 5721217920 is 297121275.

5721217920 is a `hidden beast` number, since 572 + 12 + 1 + 79 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5721217921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 45048897 + ... + 45049023.

It is an arithmetic number, because the mean of its divisors is an integer number (35544960).

Almost surely, 2^5721217920 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 5721217920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11374387200).

5721217920 is an abundant number, since it is smaller than the sum of its proper divisors (17027556480).

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

5721217920 is a wasteful number, since it uses less digits than its factorization.

5721217920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 5721217920 is about 75638.7329349190. The cubic root of 5721217920 is about 1788.5297290833.

The spelling of 5721217920 in words is "five billion, seven hundred twenty-one million, two hundred seventeen thousand, nine hundred twenty".