28022399 has 4 divisors (see below), whose sum is σ = 28034664. Its totient is φ = 28010136.

The previous prime is 28022389. The next prime is 28022411. The reversal of 28022399 is 99322082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28022399 - 2⁴ = 28022383 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 (28022329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1577 + ... + 7650.

It is an arithmetic number, because the mean of its divisors is an integer number (7008666).

Almost surely, 2^28022399 is an apocalyptic number.

28022399 is a deficient number, since it is larger than the sum of its proper divisors (12265).

28022399 is an equidigital number, since it uses as much as digits as its factorization.

28022399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12264.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28022399 is about 5293.6187055737. The cubic root of 28022399 is about 303.7398476965.

The spelling of 28022399 in words is "twenty-eight million, twenty-two thousand, three hundred ninety-nine".