28544445 has 24 divisors (see below), whose sum is σ = 52388856. Its totient is φ = 14327808.

The previous prime is 28544443. The next prime is 28544471. The reversal of 28544445 is 54444582.

It can be written as a sum of positive squares in 4 ways, for example, as 15280281 + 13264164 = 3909^2 + 3642^2 .

It is not a de Polignac number, because 28544445 - 2¹ = 28544443 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28544443) 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, 17892 + ... + 19421.

It is an arithmetic number, because the mean of its divisors is an integer number (2182869).

Almost surely, 2^28544445 is an apocalyptic number.

It is an amenable number.

28544445 is a deficient number, since it is larger than the sum of its proper divisors (23844411).

28544445 is a wasteful number, since it uses less digits than its factorization.

28544445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37341 (or 37338 counting only the distinct ones).

The product of its digits is 102400, while the sum is 36.

The square root of 28544445 is about 5342.7001600314. The cubic root of 28544445 is about 305.6144381410.

The spelling of 28544445 in words is "twenty-eight million, five hundred forty-four thousand, four hundred forty-five".