28132849 has 4 divisors (see below), whose sum is σ = 28177380. Its totient is φ = 28088320.

The previous prime is 28132801. The next prime is 28132859. The reversal of 28132849 is 94823182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94823182 = 2 ⋅47411591.

It can be written as a sum of positive squares in 2 ways, for example, as 26010000 + 2122849 = 5100^2 + 1457^2 .

It is a cyclic number.

It is not a de Polignac number, because 28132849 - 2⁷ = 28132721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28132859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21304 + ... + 22585.

It is an arithmetic number, because the mean of its divisors is an integer number (7044345).

Almost surely, 2^28132849 is an apocalyptic number.

It is an amenable number.

28132849 is a deficient number, since it is larger than the sum of its proper divisors (44531).

28132849 is an equidigital number, since it uses as much as digits as its factorization.

28132849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44530.

The product of its digits is 27648, while the sum is 37.

The square root of 28132849 is about 5304.0408180933. The cubic root of 28132849 is about 304.1383870458.

The spelling of 28132849 in words is "twenty-eight million, one hundred thirty-two thousand, eight hundred forty-nine".