28332445 has 4 divisors (see below), whose sum is σ = 33998940. Its totient is φ = 22665952.

The previous prime is 28332433. The next prime is 28332457. The reversal of 28332445 is 54423382.

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

It is an interprime number because it is at equal distance from previous prime (28332433) and next prime (28332457).

It can be written as a sum of positive squares in 2 ways, for example, as 16867449 + 11464996 = 4107^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 28332445 - 2⁵ = 28332413 is a prime.

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, 2833240 + ... + 2833249.

It is an arithmetic number, because the mean of its divisors is an integer number (8499735).

Almost surely, 2^28332445 is an apocalyptic number.

It is an amenable number.

28332445 is a deficient number, since it is larger than the sum of its proper divisors (5666495).

28332445 is an equidigital number, since it uses as much as digits as its factorization.

28332445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666494.

The product of its digits is 23040, while the sum is 31.

The square root of 28332445 is about 5322.8230291829. The cubic root of 28332445 is about 304.8559563488.

The spelling of 28332445 in words is "twenty-eight million, three hundred thirty-two thousand, four hundred forty-five".