28638647 has 2 divisors, whose sum is σ = 28638648. Its totient is φ = 28638646.

The previous prime is 28638641. The next prime is 28638679. The reversal of 28638647 is 74683682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28638647 - 2⁶ = 28638583 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28638598 and 28638607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28638641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14319323 + 14319324.

It is an arithmetic number, because the mean of its divisors is an integer number (14319324).

Almost surely, 2^28638647 is an apocalyptic number.

28638647 is a deficient number, since it is larger than the sum of its proper divisors (1).

28638647 is an equidigital number, since it uses as much as digits as its factorization.

28638647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 44.

The square root of 28638647 is about 5351.5088526508. The cubic root of 28638647 is about 305.9502638917.

The spelling of 28638647 in words is "twenty-eight million, six hundred thirty-eight thousand, six hundred forty-seven".