28479239 has 2 divisors, whose sum is σ = 28479240. Its totient is φ = 28479238.

The previous prime is 28479181. The next prime is 28479251. The reversal of 28479239 is 93297482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28479239 - 2²⁴ = 11702023 is a prime.

It is a super-2 number, since 2×28479239² = 1622134108038242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28479239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28479259) 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, 14239619 + 14239620.

It is an arithmetic number, because the mean of its divisors is an integer number (14239620).

Almost surely, 2^28479239 is an apocalyptic number.

28479239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28479239 is an equidigital number, since it uses as much as digits as its factorization.

28479239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 28479239 is about 5336.5943259723. The cubic root of 28479239 is about 305.3815488281.

The spelling of 28479239 in words is "twenty-eight million, four hundred seventy-nine thousand, two hundred thirty-nine".