5636721 has 8 divisors (see below), whose sum is σ = 7699104. Its totient is φ = 3666080.

The previous prime is 5636693. The next prime is 5636731. The reversal of 5636721 is 1276365.

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 5636721 - 2⁵ = 5636689 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5636731) 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, 22791 + ... + 23036.

It is an arithmetic number, because the mean of its divisors is an integer number (962388).

Almost surely, 2^5636721 is an apocalyptic number.

It is an amenable number.

5636721 is a deficient number, since it is larger than the sum of its proper divisors (2062383).

5636721 is a wasteful number, since it uses less digits than its factorization.

5636721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45871.

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

The square root of 5636721 is about 2374.1779630011. The cubic root of 5636721 is about 177.9681064770.

The spelling of 5636721 in words is "five million, six hundred thirty-six thousand, seven hundred twenty-one".