28281745 has 8 divisors (see below), whose sum is σ = 34727616. Its totient is φ = 22099056.

The previous prime is 28281739. The next prime is 28281749. The reversal of 28281745 is 54718282.

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 28281745 - 2¹⁵ = 28248977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28281749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65557 + ... + 65986.

It is an arithmetic number, because the mean of its divisors is an integer number (4340952).

Almost surely, 2^28281745 is an apocalyptic number.

It is an amenable number.

28281745 is a deficient number, since it is larger than the sum of its proper divisors (6445871).

28281745 is a wasteful number, since it uses less digits than its factorization.

28281745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131591.

The product of its digits is 35840, while the sum is 37.

The square root of 28281745 is about 5318.0583862910. The cubic root of 28281745 is about 304.6740044603.

The spelling of 28281745 in words is "twenty-eight million, two hundred eighty-one thousand, seven hundred forty-five".