28784579 has 2 divisors, whose sum is σ = 28784580. Its totient is φ = 28784578.

The previous prime is 28784549. The next prime is 28784593. The reversal of 28784579 is 97548782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28784579 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28784549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392289 + 14392290.

It is an arithmetic number, because the mean of its divisors is an integer number (14392290).

Almost surely, 2^28784579 is an apocalyptic number.

28784579 is a deficient number, since it is larger than the sum of its proper divisors (1).

28784579 is an equidigital number, since it uses as much as digits as its factorization.

28784579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 50.

The square root of 28784579 is about 5365.1261867732. The cubic root of 28784579 is about 306.4690536631.

The spelling of 28784579 in words is "twenty-eight million, seven hundred eighty-four thousand, five hundred seventy-nine".