28223869 has 2 divisors, whose sum is σ = 28223870. Its totient is φ = 28223868.

The previous prime is 28223861. The next prime is 28223887. The reversal of 28223869 is 96832282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17530969 + 10692900 = 4187^2 + 3270^2 .

It is a cyclic number.

It is not a de Polignac number, because 28223869 - 2³ = 28223861 is a prime.

It is a super-2 number, since 2×28223869² = 1593173562658322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28223861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111934 + 14111935.

It is an arithmetic number, because the mean of its divisors is an integer number (14111935).

Almost surely, 2^28223869 is an apocalyptic number.

It is an amenable number.

28223869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28223869 is an equidigital number, since it uses as much as digits as its factorization.

28223869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 28223869 is about 5312.6141399503. The cubic root of 28223869 is about 304.4660333858.

It can be divided in two parts, 28223 and 869, that added together give a palindrome (29092).

The spelling of 28223869 in words is "twenty-eight million, two hundred twenty-three thousand, eight hundred sixty-nine".