28218007 has 2 divisors, whose sum is σ = 28218008. Its totient is φ = 28218006.

The previous prime is 28217999. The next prime is 28218017. The reversal of 28218007 is 70081282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28218007 - 2³ = 28217999 is a 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 (28218017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109003 + 14109004.

It is an arithmetic number, because the mean of its divisors is an integer number (14109004).

Almost surely, 2^28218007 is an apocalyptic number.

28218007 is a deficient number, since it is larger than the sum of its proper divisors (1).

28218007 is an equidigital number, since it uses as much as digits as its factorization.

28218007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 28218007 is about 5312.0624055069. The cubic root of 28218007 is about 304.4449530788. Note that the first 3 decimals are identical.

Adding to 28218007 its reverse (70081282), we get a palindrome (98299289).

The spelling of 28218007 in words is "twenty-eight million, two hundred eighteen thousand, seven".