28028574085 has 4 divisors (see below), whose sum is σ = 33634288908. Its totient is φ = 22422859264.

The previous prime is 28028574053. The next prime is 28028574131. The reversal of 28028574085 is 58047582082.

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 12153078081 + 15875496004 = 110241^2 + 125998^2 .

It is a cyclic number.

It is not a de Polignac number, because 28028574085 - 2⁵ = 28028574053 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 2802857404 + ... + 2802857413.

It is an arithmetic number, because the mean of its divisors is an integer number (8408572227).

Almost surely, 2^28028574085 is an apocalyptic number.

It is an amenable number.

28028574085 is a deficient number, since it is larger than the sum of its proper divisors (5605714823).

28028574085 is an equidigital number, since it uses as much as digits as its factorization.

28028574085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5605714822.

The product of its (nonzero) digits is 1433600, while the sum is 49.

The spelling of 28028574085 in words is "twenty-eight billion, twenty-eight million, five hundred seventy-four thousand, eighty-five".