28268645 has 8 divisors (see below), whose sum is σ = 34223256. Its totient is φ = 22414336.

The previous prime is 28268623. The next prime is 28268677. The reversal of 28268645 is 54686282.

It can be written as a sum of positive squares in 4 ways, for example, as 2553604 + 25715041 = 1598^2 + 5071^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28268645 - 2¹⁴ = 28252261 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 7 ways as a sum of consecutive naturals, for example, 24452 + ... + 25581.

It is an arithmetic number, because the mean of its divisors is an integer number (4277907).

Almost surely, 2^28268645 is an apocalyptic number.

It is an amenable number.

28268645 is a deficient number, since it is larger than the sum of its proper divisors (5954611).

28268645 is a wasteful number, since it uses less digits than its factorization.

28268645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50151.

The product of its digits is 184320, while the sum is 41.

The square root of 28268645 is about 5316.8265911162. The cubic root of 28268645 is about 304.6269559035.

The spelling of 28268645 in words is "twenty-eight million, two hundred sixty-eight thousand, six hundred forty-five".