28226789 has 2 divisors, whose sum is σ = 28226790. Its totient is φ = 28226788.

The previous prime is 28226777. The next prime is 28226797. The reversal of 28226789 is 98762282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27478564 + 748225 = 5242^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 28226789 - 2²⁰ = 27178213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28226719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14113394 + 14113395.

It is an arithmetic number, because the mean of its divisors is an integer number (14113395).

Almost surely, 2^28226789 is an apocalyptic number.

It is an amenable number.

28226789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28226789 is an equidigital number, since it uses as much as digits as its factorization.

28226789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 28226789 is about 5312.8889504675. Note that the first 3 decimals coincide. The cubic root of 28226789 is about 304.4765328931.

The spelling of 28226789 in words is "twenty-eight million, two hundred twenty-six thousand, seven hundred eighty-nine".