28870427 has 2 divisors, whose sum is σ = 28870428. Its totient is φ = 28870426.

The previous prime is 28870423. The next prime is 28870433. The reversal of 28870427 is 72407882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28870427 - 2² = 28870423 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28870423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14435213 + 14435214.

It is an arithmetic number, because the mean of its divisors is an integer number (14435214).

Almost surely, 2^28870427 is an apocalyptic number.

28870427 is a deficient number, since it is larger than the sum of its proper divisors (1).

28870427 is an equidigital number, since it uses as much as digits as its factorization.

28870427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 28870427 is about 5373.1207877732. The cubic root of 28870427 is about 306.7734254693.

The spelling of 28870427 in words is "twenty-eight million, eight hundred seventy thousand, four hundred twenty-seven".