28218719 has 2 divisors, whose sum is σ = 28218720. Its totient is φ = 28218718.

The previous prime is 28218637. The next prime is 28218727. The reversal of 28218719 is 91781282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28218719 - 2²⁴ = 11441503 is a prime.

It is a super-2 number, since 2×28218719² = 1592592204001922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28218739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109359 + 14109360.

It is an arithmetic number, because the mean of its divisors is an integer number (14109360).

Almost surely, 2^28218719 is an apocalyptic number.

28218719 is a deficient number, since it is larger than the sum of its proper divisors (1).

28218719 is an equidigital number, since it uses as much as digits as its factorization.

28218719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 38.

The square root of 28218719 is about 5312.1294223692. The cubic root of 28218719 is about 304.4475136540.

The spelling of 28218719 in words is "twenty-eight million, two hundred eighteen thousand, seven hundred nineteen".