28236499 has 4 divisors (see below), whose sum is σ = 28251160. Its totient is φ = 28221840.

The previous prime is 28236493. The next prime is 28236539. The reversal of 28236499 is 99463282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99463282 = 2 ⋅49731641.

It is a cyclic number.

It is not a de Polignac number, because 28236499 - 2³ = 28236491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28236491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3909 + ... + 8470.

It is an arithmetic number, because the mean of its divisors is an integer number (7062790).

Almost surely, 2^28236499 is an apocalyptic number.

28236499 is a deficient number, since it is larger than the sum of its proper divisors (14661).

28236499 is a wasteful number, since it uses less digits than its factorization.

28236499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14660.

The product of its digits is 186624, while the sum is 43.

The square root of 28236499 is about 5313.8026873417. The cubic root of 28236499 is about 304.5114421442.

The spelling of 28236499 in words is "twenty-eight million, two hundred thirty-six thousand, four hundred ninety-nine".