28239427 has 2 divisors, whose sum is σ = 28239428. Its totient is φ = 28239426.

The previous prime is 28239413. The next prime is 28239437. The reversal of 28239427 is 72493282.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28239427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28239437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14119713 + 14119714.

It is an arithmetic number, because the mean of its divisors is an integer number (14119714).

Almost surely, 2^28239427 is an apocalyptic number.

28239427 is a deficient number, since it is larger than the sum of its proper divisors (1).

28239427 is an equidigital number, since it uses as much as digits as its factorization.

28239427 is an evil number, because the sum of its binary digits is even.

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

The square root of 28239427 is about 5314.0781891124. The cubic root of 28239427 is about 304.5219672767.

The spelling of 28239427 in words is "twenty-eight million, two hundred thirty-nine thousand, four hundred twenty-seven".