5228721 has 6 divisors (see below), whose sum is σ = 7552610. Its totient is φ = 3485808.

The previous prime is 5228687. The next prime is 5228723. The reversal of 5228721 is 1278225.

It can be written as a sum of positive squares in only one way, i.e., 3111696 + 2117025 = 1764^2 + 1455^2 .

It is not a de Polignac number, because 5228721 - 2⁷ = 5228593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5228723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290476 + ... + 290493.

Almost surely, 2^5228721 is an apocalyptic number.

It is an amenable number.

5228721 is a deficient number, since it is larger than the sum of its proper divisors (2323889).

5228721 is a wasteful number, since it uses less digits than its factorization.

5228721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580975 (or 580972 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 5228721 is about 2286.6396742819. The cubic root of 5228721 is about 173.5662004072.

The spelling of 5228721 in words is "five million, two hundred twenty-eight thousand, seven hundred twenty-one".