28705427 has 2 divisors, whose sum is σ = 28705428. Its totient is φ = 28705426.

The previous prime is 28705399. The next prime is 28705487. The reversal of 28705427 is 72450782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28705427 - 2⁶ = 28705363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28705487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352713 + 14352714.

It is an arithmetic number, because the mean of its divisors is an integer number (14352714).

Almost surely, 2^28705427 is an apocalyptic number.

28705427 is a deficient number, since it is larger than the sum of its proper divisors (1).

28705427 is an equidigital number, since it uses as much as digits as its factorization.

28705427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 28705427 is about 5357.7445814447. The cubic root of 28705427 is about 306.1878856673.

The spelling of 28705427 in words is "twenty-eight million, seven hundred five thousand, four hundred twenty-seven".