28424993 has 2 divisors, whose sum is σ = 28424994. Its totient is φ = 28424992.

The previous prime is 28424953. The next prime is 28425029. The reversal of 28424993 is 39942482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21418384 + 7006609 = 4628^2 + 2647^2 .

It is a cyclic number.

It is not a de Polignac number, because 28424993 - 2¹⁴ = 28408609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28424993.

It is not a weakly prime, because it can be changed into another prime (28424953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14212496 + 14212497.

It is an arithmetic number, because the mean of its divisors is an integer number (14212497).

Almost surely, 2^28424993 is an apocalyptic number.

It is an amenable number.

28424993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28424993 is an equidigital number, since it uses as much as digits as its factorization.

28424993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 28424993 is about 5331.5094485521. The cubic root of 28424993 is about 305.1875331508.

The spelling of 28424993 in words is "twenty-eight million, four hundred twenty-four thousand, nine hundred ninety-three".