28766539 has 2 divisors, whose sum is σ = 28766540. Its totient is φ = 28766538.

The previous prime is 28766519. The next prime is 28766587. The reversal of 28766539 is 93566782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28766539 - 2²¹ = 26669387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28766519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14383269 + 14383270.

It is an arithmetic number, because the mean of its divisors is an integer number (14383270).

Almost surely, 2^28766539 is an apocalyptic number.

28766539 is a deficient number, since it is larger than the sum of its proper divisors (1).

28766539 is an equidigital number, since it uses as much as digits as its factorization.

28766539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 28766539 is about 5363.4446953427. Note that the first 3 decimals coincide. The cubic root of 28766539 is about 306.4050163983.

The spelling of 28766539 in words is "twenty-eight million, seven hundred sixty-six thousand, five hundred thirty-nine".