28422239 has 4 divisors (see below), whose sum is σ = 28741680. Its totient is φ = 28102800.

The previous prime is 28422221. The next prime is 28422259. The reversal of 28422239 is 93222482.

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

It is a cyclic number.

It is not a de Polignac number, because 28422239 - 2⁸ = 28421983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28422259) 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, 159587 + ... + 159764.

It is an arithmetic number, because the mean of its divisors is an integer number (7185420).

Almost surely, 2^28422239 is an apocalyptic number.

28422239 is a deficient number, since it is larger than the sum of its proper divisors (319441).

28422239 is an equidigital number, since it uses as much as digits as its factorization.

28422239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319440.

The product of its digits is 13824, while the sum is 32.

The square root of 28422239 is about 5331.2511664712. The cubic root of 28422239 is about 305.1776766416.

The spelling of 28422239 in words is "twenty-eight million, four hundred twenty-two thousand, two hundred thirty-nine".