28839647 has 2 divisors, whose sum is σ = 28839648. Its totient is φ = 28839646.

The previous prime is 28839637. The next prime is 28839673. The reversal of 28839647 is 74693882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28839647 - 2⁶ = 28839583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28839637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14419823 + 14419824.

It is an arithmetic number, because the mean of its divisors is an integer number (14419824).

Almost surely, 2^28839647 is an apocalyptic number.

28839647 is a deficient number, since it is larger than the sum of its proper divisors (1).

28839647 is an equidigital number, since it uses as much as digits as its factorization.

28839647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 47.

The square root of 28839647 is about 5370.2557667210. The cubic root of 28839647 is about 306.6643652684.

The spelling of 28839647 in words is "twenty-eight million, eight hundred thirty-nine thousand, six hundred forty-seven".