28538999 has 2 divisors, whose sum is σ = 28539000. Its totient is φ = 28538998.

The previous prime is 28538977. The next prime is 28539001. The reversal of 28538999 is 99983582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28538999 is a prime.

Together with 28539001, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 28538999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28538959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14269499 + 14269500.

It is an arithmetic number, because the mean of its divisors is an integer number (14269500).

Almost surely, 2^28538999 is an apocalyptic number.

28538999 is a deficient number, since it is larger than the sum of its proper divisors (1).

28538999 is an equidigital number, since it uses as much as digits as its factorization.

28538999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 53.

The square root of 28538999 is about 5342.1904683379. The cubic root of 28538999 is about 305.5950008262.

The spelling of 28538999 in words is "twenty-eight million, five hundred thirty-eight thousand, nine hundred ninety-nine".