28044045 has 24 divisors (see below), whose sum is σ = 49281336. Its totient is φ = 14750208.

The previous prime is 28044043. The next prime is 28044047. The reversal of 28044045 is 54044082.

It is an interprime number because it is at equal distance from previous prime (28044043) and next prime (28044047).

It can be written as a sum of positive squares in 4 ways, for example, as 8277129 + 19766916 = 2877^2 + 4446^2 .

It is not a de Polignac number, because 28044045 - 2¹ = 28044043 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28044043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 984 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (2053389).

Almost surely, 2^28044045 is an apocalyptic number.

It is an amenable number.

28044045 is a deficient number, since it is larger than the sum of its proper divisors (21237291).

28044045 is a wasteful number, since it uses less digits than its factorization.

28044045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8621 (or 8618 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 28044045 is about 5295.6628480295. The cubic root of 28044045 is about 303.8180358698.

The spelling of 28044045 in words is "twenty-eight million, forty-four thousand, forty-five".