28201819 has 2 divisors, whose sum is σ = 28201820. Its totient is φ = 28201818.

The previous prime is 28201813. The next prime is 28201837. The reversal of 28201819 is 91810282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28201819 - 2⁵ = 28201787 is a prime.

It is a super-2 number, since 2×28201819² = 1590685189817522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28201813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14100909 + 14100910.

It is an arithmetic number, because the mean of its divisors is an integer number (14100910).

Almost surely, 2^28201819 is an apocalyptic number.

28201819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28201819 is an equidigital number, since it uses as much as digits as its factorization.

28201819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 28201819 is about 5310.5384849373. The cubic root of 28201819 is about 304.3867243311.

The spelling of 28201819 in words is "twenty-eight million, two hundred one thousand, eight hundred nineteen".