28445749 has 2 divisors, whose sum is σ = 28445750. Its totient is φ = 28445748.

The previous prime is 28445701. The next prime is 28445761. The reversal of 28445749 is 94754482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25908100 + 2537649 = 5090^2 + 1593^2 .

It is a cyclic number.

It is not a de Polignac number, because 28445749 - 2⁹ = 28445237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28445449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14222874 + 14222875.

It is an arithmetic number, because the mean of its divisors is an integer number (14222875).

Almost surely, 2^28445749 is an apocalyptic number.

It is an amenable number.

28445749 is a deficient number, since it is larger than the sum of its proper divisors (1).

28445749 is an equidigital number, since it uses as much as digits as its factorization.

28445749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 43.

The square root of 28445749 is about 5333.4556340144. The cubic root of 28445749 is about 305.2617979741.

The spelling of 28445749 in words is "twenty-eight million, four hundred forty-five thousand, seven hundred forty-nine".