28056365 has 4 divisors (see below), whose sum is σ = 33667644. Its totient is φ = 22445088.

The previous prime is 28056361. The next prime is 28056373. The reversal of 28056365 is 56365082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56365082 = 2 ⋅28182541.

It can be written as a sum of positive squares in 2 ways, for example, as 9229444 + 18826921 = 3038^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 28056365 - 2² = 28056361 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 (28056361) 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, 2805632 + ... + 2805641.

It is an arithmetic number, because the mean of its divisors is an integer number (8416911).

Almost surely, 2^28056365 is an apocalyptic number.

It is an amenable number.

28056365 is a deficient number, since it is larger than the sum of its proper divisors (5611279).

28056365 is an equidigital number, since it uses as much as digits as its factorization.

28056365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611278.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 28056365 is about 5296.8259363509. The cubic root of 28056365 is about 303.8625193507.

The spelling of 28056365 in words is "twenty-eight million, fifty-six thousand, three hundred sixty-five".