28872539 has 2 divisors, whose sum is σ = 28872540. Its totient is φ = 28872538.

The previous prime is 28872499. The next prime is 28872551. The reversal of 28872539 is 93527882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28872539 - 2¹⁶ = 28807003 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28872539.

It is not a weakly prime, because it can be changed into another prime (28872589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14436269 + 14436270.

It is an arithmetic number, because the mean of its divisors is an integer number (14436270).

Almost surely, 2^28872539 is an apocalyptic number.

28872539 is a deficient number, since it is larger than the sum of its proper divisors (1).

28872539 is an equidigital number, since it uses as much as digits as its factorization.

28872539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 28872539 is about 5373.3173180076. The cubic root of 28872539 is about 306.7809058999.

It can be divided in two parts, 288 and 72539, that added together give a palindrome (72827).

The spelling of 28872539 in words is "twenty-eight million, eight hundred seventy-two thousand, five hundred thirty-nine".