28223659 has 2 divisors, whose sum is σ = 28223660. Its totient is φ = 28223658.

The previous prime is 28223651. The next prime is 28223687. The reversal of 28223659 is 95632282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28223659 - 2³ = 28223651 is a prime.

It is not a weakly prime, because it can be changed into another prime (28223651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111829 + 14111830.

It is an arithmetic number, because the mean of its divisors is an integer number (14111830).

Almost surely, 2^28223659 is an apocalyptic number.

28223659 is a deficient number, since it is larger than the sum of its proper divisors (1).

28223659 is an equidigital number, since it uses as much as digits as its factorization.

28223659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 28223659 is about 5312.5943756323. The cubic root of 28223659 is about 304.4652782563.

It can be divided in two parts, 28223 and 659, that added together give a palindrome (28882).

The spelling of 28223659 in words is "twenty-eight million, two hundred twenty-three thousand, six hundred fifty-nine".