28727443 has 4 divisors (see below), whose sum is σ = 28794528. Its totient is φ = 28660360.

The previous prime is 28727417. The next prime is 28727459. The reversal of 28727443 is 34472782.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28727443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28727143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32896 + ... + 33757.

It is an arithmetic number, because the mean of its divisors is an integer number (7198632).

Almost surely, 2^28727443 is an apocalyptic number.

28727443 is a deficient number, since it is larger than the sum of its proper divisors (67085).

28727443 is an equidigital number, since it uses as much as digits as its factorization.

28727443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67084.

The product of its digits is 75264, while the sum is 37.

The square root of 28727443 is about 5359.7987835366. The cubic root of 28727443 is about 306.2661439220.

It can be divided in two parts, 287 and 27443, that added together give a triangular number (27730 = T₂₃₅).

The spelling of 28727443 in words is "twenty-eight million, seven hundred twenty-seven thousand, four hundred forty-three".