28422397 has 4 divisors (see below), whose sum is σ = 28433916. Its totient is φ = 28410880.

The previous prime is 28422391. The next prime is 28422403. The reversal of 28422397 is 79322482.

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 an interprime number because it is at equal distance from previous prime (28422391) and next prime (28422403).

It can be written as a sum of positive squares in 2 ways, for example, as 27154521 + 1267876 = 5211^2 + 1126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28422397 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 (28422391) 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, 388 + ... + 7549.

It is an arithmetic number, because the mean of its divisors is an integer number (7108479).

Almost surely, 2^28422397 is an apocalyptic number.

It is an amenable number.

28422397 is a deficient number, since it is larger than the sum of its proper divisors (11519).

28422397 is an equidigital number, since it uses as much as digits as its factorization.

28422397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11518.

The product of its digits is 48384, while the sum is 37.

The square root of 28422397 is about 5331.2659847357. The cubic root of 28422397 is about 305.1782421376.

The spelling of 28422397 in words is "twenty-eight million, four hundred twenty-two thousand, three hundred ninety-seven".