5721660 has 144 divisors (see below), whose sum is σ = 20966400. Its totient is φ = 1233792.

The previous prime is 5721659. The next prime is 5721689. The reversal of 5721660 is 661275.

5721660 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 23821 + ... + 24059.

It is an arithmetic number, because the mean of its divisors is an integer number (145600).

Almost surely, 2^5721660 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 5721660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10483200).

5721660 is an abundant number, since it is smaller than the sum of its proper divisors (15244740).

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

5721660 is a wasteful number, since it uses less digits than its factorization.

5721660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 5721660 is about 2391.9991638795. Note that the first 3 decimals coincide. The cubic root of 5721660 is about 178.8575794616.

The spelling of 5721660 in words is "five million, seven hundred twenty-one thousand, six hundred sixty".