28072285 has 8 divisors (see below), whose sum is σ = 34034616. Its totient is φ = 22225920.

The previous prime is 28072279. The next prime is 28072309. The reversal of 28072285 is 58227082.

It can be written as a sum of positive squares in 4 ways, for example, as 3481 + 28068804 = 59^2 + 5298^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28072285 - 2⁷ = 28072157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28072285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28456 + ... + 29425.

It is an arithmetic number, because the mean of its divisors is an integer number (4254327).

Almost surely, 2^28072285 is an apocalyptic number.

It is an amenable number.

28072285 is a deficient number, since it is larger than the sum of its proper divisors (5962331).

28072285 is an equidigital number, since it uses as much as digits as its factorization.

28072285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57983.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28072285 is about 5298.3285100114. The cubic root of 28072285 is about 303.9199819695.

The spelling of 28072285 in words is "twenty-eight million, seventy-two thousand, two hundred eighty-five".