28135439 has 2 divisors, whose sum is σ = 28135440. Its totient is φ = 28135438.

The previous prime is 28135433. The next prime is 28135483. The reversal of 28135439 is 93453182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28135439 - 2¹⁶ = 28069903 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28135399 and 28135408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28135433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14067719 + 14067720.

It is an arithmetic number, because the mean of its divisors is an integer number (14067720).

Almost surely, 2^28135439 is an apocalyptic number.

28135439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28135439 is an equidigital number, since it uses as much as digits as its factorization.

28135439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 28135439 is about 5304.2849659497. The cubic root of 28135439 is about 304.1477200767.

The spelling of 28135439 in words is "twenty-eight million, one hundred thirty-five thousand, four hundred thirty-nine".