28445653 has 4 divisors (see below), whose sum is σ = 28846368. Its totient is φ = 28044940.

The previous prime is 28445639. The next prime is 28445689. The reversal of 28445653 is 35654482.

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 28445653 - 2⁹ = 28445141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28445623) 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 in 3 ways as a sum of consecutive naturals, for example, 200251 + ... + 200392.

It is an arithmetic number, because the mean of its divisors is an integer number (7211592).

Almost surely, 2^28445653 is an apocalyptic number.

It is an amenable number.

28445653 is a deficient number, since it is larger than the sum of its proper divisors (400715).

28445653 is an equidigital number, since it uses as much as digits as its factorization.

28445653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400714.

The product of its digits is 115200, while the sum is 37.

The square root of 28445653 is about 5333.4466342132. The cubic root of 28445653 is about 305.2614545699.

The spelling of 28445653 in words is "twenty-eight million, four hundred forty-five thousand, six hundred fifty-three".