28223511 has 8 divisors (see below), whose sum is σ = 37839984. Its totient is φ = 18711360.

The previous prime is 28223509. The next prime is 28223513. The reversal of 28223511 is 11532282.

It is an interprime number because it is at equal distance from previous prime (28223509) and next prime (28223513).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28223511 - 2¹ = 28223509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28223513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25446 + ... + 26531.

It is an arithmetic number, because the mean of its divisors is an integer number (4729998).

Almost surely, 2^28223511 is an apocalyptic number.

28223511 is a deficient number, since it is larger than the sum of its proper divisors (9616473).

28223511 is a wasteful number, since it uses less digits than its factorization.

28223511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52161.

The product of its digits is 960, while the sum is 24.

The square root of 28223511 is about 5312.5804464497. The cubic root of 28223511 is about 304.4647460676.

Adding to 28223511 its reverse (11532282), we get a palindrome (39755793).

The spelling of 28223511 in words is "twenty-eight million, two hundred twenty-three thousand, five hundred eleven".