28245749 has 4 divisors (see below), whose sum is σ = 32280864. Its totient is φ = 24210636.

The previous prime is 28245727. The next prime is 28245779. The reversal of 28245749 is 94754282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28245749 - 2²⁰ = 27197173 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28245779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2017547 + ... + 2017560.

It is an arithmetic number, because the mean of its divisors is an integer number (8070216).

Almost surely, 2^28245749 is an apocalyptic number.

It is an amenable number.

28245749 is a deficient number, since it is larger than the sum of its proper divisors (4035115).

28245749 is an equidigital number, since it uses as much as digits as its factorization.

28245749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035114.

The product of its digits is 161280, while the sum is 41.

The square root of 28245749 is about 5314.6729908810. The cubic root of 28245749 is about 304.5446901673.

The spelling of 28245749 in words is "twenty-eight million, two hundred forty-five thousand, seven hundred forty-nine".