28027445 has 4 divisors (see below), whose sum is σ = 33632940. Its totient is φ = 22421952.

The previous prime is 28027411. The next prime is 28027453. The reversal of 28027445 is 54472082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8720209 + 19307236 = 2953^2 + 4394^2 .

It is a cyclic number.

It is not a de Polignac number, because 28027445 - 2⁶ = 28027381 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2802740 + ... + 2802749.

It is an arithmetic number, because the mean of its divisors is an integer number (8408235).

Almost surely, 2^28027445 is an apocalyptic number.

It is an amenable number.

28027445 is a deficient number, since it is larger than the sum of its proper divisors (5605495).

28027445 is an equidigital number, since it uses as much as digits as its factorization.

28027445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5605494.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 28027445 is about 5294.0952957045. The cubic root of 28027445 is about 303.7580781043.

The spelling of 28027445 in words is "twenty-eight million, twenty-seven thousand, four hundred forty-five".