28874443 has 4 divisors (see below), whose sum is σ = 31095568. Its totient is φ = 26653320.

The previous prime is 28874441. The next prime is 28874477. The reversal of 28874443 is 34447882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28874443 - 2¹ = 28874441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28874396 and 28874405.

It is not an unprimeable number, because it can be changed into a prime (28874441) 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, 1110543 + ... + 1110568.

It is an arithmetic number, because the mean of its divisors is an integer number (7773892).

Almost surely, 2^28874443 is an apocalyptic number.

28874443 is a deficient number, since it is larger than the sum of its proper divisors (2221125).

28874443 is a wasteful number, since it uses less digits than its factorization.

28874443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221124.

The product of its digits is 172032, while the sum is 40.

The square root of 28874443 is about 5373.4944868307. The cubic root of 28874443 is about 306.7876493087.

The spelling of 28874443 in words is "twenty-eight million, eight hundred seventy-four thousand, four hundred forty-three".