28218499 has 2 divisors, whose sum is σ = 28218500. Its totient is φ = 28218498.

The previous prime is 28218469. The next prime is 28218523. The reversal of 28218499 is 99481282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28218499 - 2⁷ = 28218371 is a prime.

It is not a weakly prime, because it can be changed into another prime (28218409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109249 + 14109250.

It is an arithmetic number, because the mean of its divisors is an integer number (14109250).

Almost surely, 2^28218499 is an apocalyptic number.

28218499 is a deficient number, since it is larger than the sum of its proper divisors (1).

28218499 is an equidigital number, since it uses as much as digits as its factorization.

28218499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 43.

The square root of 28218499 is about 5312.1087150020. The cubic root of 28218499 is about 304.4467224696.

It can be divided in two parts, 282 and 18499, that added together give a palindrome (18781).

The spelling of 28218499 in words is "twenty-eight million, two hundred eighteen thousand, four hundred ninety-nine".