28322745 has 16 divisors (see below), whose sum is σ = 49436352. Its totient is φ = 13732160.

The previous prime is 28322743. The next prime is 28322761. The reversal of 28322745 is 54722382.

It is not a de Polignac number, because 28322745 - 2¹ = 28322743 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28322743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85662 + ... + 85991.

It is an arithmetic number, because the mean of its divisors is an integer number (3089772).

Almost surely, 2^28322745 is an apocalyptic number.

It is an amenable number.

28322745 is a deficient number, since it is larger than the sum of its proper divisors (21113607).

28322745 is a wasteful number, since it uses less digits than its factorization.

28322745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171672.

The product of its digits is 26880, while the sum is 33.

The square root of 28322745 is about 5321.9117805541. The cubic root of 28322745 is about 304.8211618425.

The spelling of 28322745 in words is "twenty-eight million, three hundred twenty-two thousand, seven hundred forty-five".