28687339 has 2 divisors, whose sum is σ = 28687340. Its totient is φ = 28687338.

The previous prime is 28687319. The next prime is 28687357. The reversal of 28687339 is 93378682.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28687339 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28687319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343669 + 14343670.

It is an arithmetic number, because the mean of its divisors is an integer number (14343670).

Almost surely, 2^28687339 is an apocalyptic number.

28687339 is a deficient number, since it is larger than the sum of its proper divisors (1).

28687339 is an equidigital number, since it uses as much as digits as its factorization.

28687339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 28687339 is about 5356.0562917131. The cubic root of 28687339 is about 306.1235599661.

The spelling of 28687339 in words is "twenty-eight million, six hundred eighty-seven thousand, three hundred thirty-nine".