28043539 has 2 divisors, whose sum is σ = 28043540. Its totient is φ = 28043538.

The previous prime is 28043531. The next prime is 28043599. The reversal of 28043539 is 93534082.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28043539 - 2³ = 28043531 is a prime.

It is not a weakly prime, because it can be changed into another prime (28043531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14021769 + 14021770.

It is an arithmetic number, because the mean of its divisors is an integer number (14021770).

Almost surely, 2^28043539 is an apocalyptic number.

28043539 is a deficient number, since it is larger than the sum of its proper divisors (1).

28043539 is an equidigital number, since it uses as much as digits as its factorization.

28043539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 28043539 is about 5295.6150728693. The cubic root of 28043539 is about 303.8162085912.

It can be divided in two parts, 28043 and 539, that added together give a palindrome (28582).

The spelling of 28043539 in words is "twenty-eight million, forty-three thousand, five hundred thirty-nine".