28727371 has 4 divisors (see below), whose sum is σ = 29718000. Its totient is φ = 27736744.

The previous prime is 28727357. The next prime is 28727407. The reversal of 28727371 is 17372782.

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 28727371 - 2¹⁷ = 28596299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28727371.

It is not an unprimeable number, because it can be changed into a prime (28727071) 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, 495271 + ... + 495328.

It is an arithmetic number, because the mean of its divisors is an integer number (7429500).

Almost surely, 2^28727371 is an apocalyptic number.

28727371 is a deficient number, since it is larger than the sum of its proper divisors (990629).

28727371 is an equidigital number, since it uses as much as digits as its factorization.

28727371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990628.

The product of its digits is 32928, while the sum is 37.

The square root of 28727371 is about 5359.7920668623. The cubic root of 28727371 is about 306.2658880554.

The spelling of 28727371 in words is "twenty-eight million, seven hundred twenty-seven thousand, three hundred seventy-one".