28109841 has 16 divisors (see below), whose sum is σ = 39266304. Its totient is φ = 17853264.

The previous prime is 28109827. The next prime is 28109867. The reversal of 28109841 is 14890182.

It is not a de Polignac number, because 28109841 - 2¹⁵ = 28077073 is a prime.

It is a super-2 number, since 2×28109841² = 1580326322090562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28109821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20520 + ... + 21846.

It is an arithmetic number, because the mean of its divisors is an integer number (2454144).

Almost surely, 2^28109841 is an apocalyptic number.

It is an amenable number.

28109841 is a deficient number, since it is larger than the sum of its proper divisors (11156463).

28109841 is a wasteful number, since it uses less digits than its factorization.

28109841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 28109841 is about 5301.8714620406. The cubic root of 28109841 is about 304.0554528632.

The spelling of 28109841 in words is "twenty-eight million, one hundred nine thousand, eight hundred forty-one".