28727539 has 4 divisors (see below), whose sum is σ = 28807920. Its totient is φ = 28647160.

The previous prime is 28727519. The next prime is 28727549. The reversal of 28727539 is 93572782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93572782 = 2 ⋅46786391.

It is a cyclic number.

It is not a de Polignac number, because 28727539 - 2¹¹ = 28725491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28727495 and 28727504.

It is not an unprimeable number, because it can be changed into a prime (28727519) 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, 39652 + ... + 40369.

It is an arithmetic number, because the mean of its divisors is an integer number (7201980).

Almost surely, 2^28727539 is an apocalyptic number.

28727539 is a deficient number, since it is larger than the sum of its proper divisors (80381).

28727539 is an equidigital number, since it uses as much as digits as its factorization.

28727539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80380.

The product of its digits is 211680, while the sum is 43.

The square root of 28727539 is about 5359.8077390892. The cubic root of 28727539 is about 306.2664850768.

The spelling of 28727539 in words is "twenty-eight million, seven hundred twenty-seven thousand, five hundred thirty-nine".