5721663 has 8 divisors (see below), whose sum is σ = 7641648. Its totient is φ = 3808064.

The previous prime is 5721659. The next prime is 5721689. The reversal of 5721663 is 3661275.

5721663 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 2392²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5721663 - 2² = 5721659 is a prime.

5721663 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 5721663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5721563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1195 + ... + 3587.

It is an arithmetic number, because the mean of its divisors is an integer number (955206).

Almost surely, 2^5721663 is an apocalyptic number.

5721663 is a deficient number, since it is larger than the sum of its proper divisors (1919985).

5721663 is a wasteful number, since it uses less digits than its factorization.

5721663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3193.

The product of its digits is 7560, while the sum is 30.

The square root of 5721663 is about 2391.9997909699. Note that the first 3 decimals coincide. The cubic root of 5721663 is about 178.8576107214.

The spelling of 5721663 in words is "five million, seven hundred twenty-one thousand, six hundred sixty-three".