28224065 has 4 divisors (see below), whose sum is σ = 33868884. Its totient is φ = 22579248.

The previous prime is 28224061. The next prime is 28224071. The reversal of 28224065 is 56042282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56042282 = 2 ⋅28021141.

It can be written as a sum of positive squares in 2 ways, for example, as 7639696 + 20584369 = 2764^2 + 4537^2 .

It is a cyclic number.

It is not a de Polignac number, because 28224065 - 2² = 28224061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28224061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2822402 + ... + 2822411.

It is an arithmetic number, because the mean of its divisors is an integer number (8467221).

Almost surely, 2^28224065 is an apocalyptic number.

It is an amenable number.

28224065 is a deficient number, since it is larger than the sum of its proper divisors (5644819).

28224065 is an equidigital number, since it uses as much as digits as its factorization.

28224065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5644818.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 28224065 is about 5312.6325865808. The cubic root of 28224065 is about 304.4667381699.

The spelling of 28224065 in words is "twenty-eight million, two hundred twenty-four thousand, sixty-five".