28147085 has 4 divisors (see below), whose sum is σ = 33776508. Its totient is φ = 22517664.

The previous prime is 28147079. The next prime is 28147103. The reversal of 28147085 is 58074182.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3087049 + 25060036 = 1757^2 + 5006^2 .

It is a cyclic number.

It is not a de Polignac number, because 28147085 - 2¹⁰ = 28146061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2814704 + ... + 2814713.

It is an arithmetic number, because the mean of its divisors is an integer number (8444127).

Almost surely, 2^28147085 is an apocalyptic number.

It is an amenable number.

28147085 is a deficient number, since it is larger than the sum of its proper divisors (5629423).

28147085 is an equidigital number, since it uses as much as digits as its factorization.

28147085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5629422.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 28147085 is about 5305.3826440701. The cubic root of 28147085 is about 304.1896792080.

The spelling of 28147085 in words is "twenty-eight million, one hundred forty-seven thousand, eighty-five".