28578727 has 4 divisors (see below), whose sum is σ = 28590736. Its totient is φ = 28566720.

The previous prime is 28578721. The next prime is 28578731. The reversal of 28578727 is 72787582.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28578727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28578721) 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, 1098 + ... + 7639.

It is an arithmetic number, because the mean of its divisors is an integer number (7147684).

Almost surely, 2^28578727 is an apocalyptic number.

28578727 is a deficient number, since it is larger than the sum of its proper divisors (12009).

28578727 is an equidigital number, since it uses as much as digits as its factorization.

28578727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12008.

The product of its digits is 439040, while the sum is 46.

The square root of 28578727 is about 5345.9075001350. The cubic root of 28578727 is about 305.7367372740.

The spelling of 28578727 in words is "twenty-eight million, five hundred seventy-eight thousand, seven hundred twenty-seven".