28440427 has 2 divisors, whose sum is σ = 28440428. Its totient is φ = 28440426.

The previous prime is 28440413. The next prime is 28440449. The reversal of 28440427 is 72404482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28440427 - 2¹⁹ = 27916139 is a prime.

It is not a weakly prime, because it can be changed into another prime (28440407) 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 as a sum of consecutive naturals, namely, 14220213 + 14220214.

It is an arithmetic number, because the mean of its divisors is an integer number (14220214).

Almost surely, 2^28440427 is an apocalyptic number.

28440427 is a deficient number, since it is larger than the sum of its proper divisors (1).

28440427 is an equidigital number, since it uses as much as digits as its factorization.

28440427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 28440427 is about 5332.9566846169. The cubic root of 28440427 is about 305.2427593401.

The spelling of 28440427 in words is "twenty-eight million, four hundred forty thousand, four hundred twenty-seven".