28504219 has 2 divisors, whose sum is σ = 28504220. Its totient is φ = 28504218.

The previous prime is 28504213. The next prime is 28504243. The reversal of 28504219 is 91240582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28504219 - 2¹¹ = 28502171 is a prime.

It is a super-2 number, since 2×28504219² = 1624981001599922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28504213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14252109 + 14252110.

It is an arithmetic number, because the mean of its divisors is an integer number (14252110).

Almost surely, 2^28504219 is an apocalyptic number.

28504219 is a deficient number, since it is larger than the sum of its proper divisors (1).

28504219 is an equidigital number, since it uses as much as digits as its factorization.

28504219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 28504219 is about 5338.9342569468. The cubic root of 28504219 is about 305.4708091931.

The spelling of 28504219 in words is "twenty-eight million, five hundred four thousand, two hundred nineteen".