28275785 has 4 divisors (see below), whose sum is σ = 33930948. Its totient is φ = 22620624.

The previous prime is 28275769. The next prime is 28275803. The reversal of 28275785 is 58757282.

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 4108729 + 24167056 = 2027^2 + 4916^2 .

It is a cyclic number.

It is not a de Polignac number, because 28275785 - 2⁴ = 28275769 is a prime.

It is a Duffinian 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, 2827574 + ... + 2827583.

It is an arithmetic number, because the mean of its divisors is an integer number (8482737).

Almost surely, 2^28275785 is an apocalyptic number.

It is an amenable number.

28275785 is a deficient number, since it is larger than the sum of its proper divisors (5655163).

28275785 is an equidigital number, since it uses as much as digits as its factorization.

28275785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655162.

The product of its digits is 313600, while the sum is 44.

The square root of 28275785 is about 5317.4980018802. The cubic root of 28275785 is about 304.6526009645.

It can be divided in two parts, 282 and 75785, that added together give a palindrome (76067).

The spelling of 28275785 in words is "twenty-eight million, two hundred seventy-five thousand, seven hundred eighty-five".