28504243 has 2 divisors, whose sum is σ = 28504244. Its totient is φ = 28504242.

The previous prime is 28504219. The next prime is 28504249. The reversal of 28504243 is 34240582.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28504243 is a prime.

It is not a weakly prime, because it can be changed into another prime (28504249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14252121 + 14252122.

It is an arithmetic number, because the mean of its divisors is an integer number (14252122).

Almost surely, 2^28504243 is an apocalyptic number.

28504243 is a deficient number, since it is larger than the sum of its proper divisors (1).

28504243 is an equidigital number, since it uses as much as digits as its factorization.

28504243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 28504243 is about 5338.9365045859. The cubic root of 28504243 is about 305.4708949265.

The spelling of 28504243 in words is "twenty-eight million, five hundred four thousand, two hundred forty-three".