28744427 has 2 divisors, whose sum is σ = 28744428. Its totient is φ = 28744426.

The previous prime is 28744393. The next prime is 28744447. The reversal of 28744427 is 72444782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28744427 - 2¹⁶ = 28678891 is a prime.

It is not a weakly prime, because it can be changed into another prime (28744447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14372213 + 14372214.

It is an arithmetic number, because the mean of its divisors is an integer number (14372214).

Almost surely, 2^28744427 is an apocalyptic number.

28744427 is a deficient number, since it is larger than the sum of its proper divisors (1).

28744427 is an equidigital number, since it uses as much as digits as its factorization.

28744427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100352, while the sum is 38.

The square root of 28744427 is about 5361.3829372653. The cubic root of 28744427 is about 306.3264880725.

The spelling of 28744427 in words is "twenty-eight million, seven hundred forty-four thousand, four hundred twenty-seven".