28218787 has 2 divisors, whose sum is σ = 28218788. Its totient is φ = 28218786.

The previous prime is 28218767. The next prime is 28218791. The reversal of 28218787 is 78781282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28218787 - 2¹⁵ = 28186019 is a prime.

It is not a weakly prime, because it can be changed into another prime (28218727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109393 + 14109394.

It is an arithmetic number, because the mean of its divisors is an integer number (14109394).

Almost surely, 2^28218787 is an apocalyptic number.

28218787 is a deficient number, since it is larger than the sum of its proper divisors (1).

28218787 is an equidigital number, since it uses as much as digits as its factorization.

28218787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100352, while the sum is 43.

The square root of 28218787 is about 5312.1358228118. The cubic root of 28218787 is about 304.4477582010.

The spelling of 28218787 in words is "twenty-eight million, two hundred eighteen thousand, seven hundred eighty-seven".