28644441 has 32 divisors (see below), whose sum is σ = 45235200. Its totient is φ = 15785280.

The previous prime is 28644377. The next prime is 28644467. The reversal of 28644441 is 14444682.

It is not a de Polignac number, because 28644441 - 2⁶ = 28644377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28644491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75390 + ... + 75768.

It is an arithmetic number, because the mean of its divisors is an integer number (1413600).

Almost surely, 2^28644441 is an apocalyptic number.

28644441 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28644441 is a deficient number, since it is larger than the sum of its proper divisors (16590759).

28644441 is a wasteful number, since it uses less digits than its factorization.

28644441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509.

The product of its digits is 24576, while the sum is 33.

The square root of 28644441 is about 5352.0501679263. The cubic root of 28644441 is about 305.9708951771.

The spelling of 28644441 in words is "twenty-eight million, six hundred forty-four thousand, four hundred forty-one".