28226713 has 4 divisors (see below), whose sum is σ = 28689508. Its totient is φ = 27763920.

The previous prime is 28226711. The next prime is 28226719. The reversal of 28226713 is 31762282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7551504 + 20675209 = 2748^2 + 4547^2 .

It is a cyclic number.

It is not a de Polignac number, because 28226713 - 2¹ = 28226711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28226711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231306 + ... + 231427.

It is an arithmetic number, because the mean of its divisors is an integer number (7172377).

Almost surely, 2^28226713 is an apocalyptic number.

It is an amenable number.

28226713 is a deficient number, since it is larger than the sum of its proper divisors (462795).

28226713 is an equidigital number, since it uses as much as digits as its factorization.

28226713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462794.

The product of its digits is 8064, while the sum is 31.

The square root of 28226713 is about 5312.8817980452. The cubic root of 28226713 is about 304.4762596274.

Adding to 28226713 its reverse (31762282), we get a palindrome (59988995).

The spelling of 28226713 in words is "twenty-eight million, two hundred twenty-six thousand, seven hundred thirteen".