28281765 has 16 divisors (see below), whose sum is σ = 46711296. Its totient is φ = 14596800.

The previous prime is 28281749. The next prime is 28281767. The reversal of 28281765 is 56718282.

It is not a de Polignac number, because 28281765 - 2⁴ = 28281749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28281767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29946 + ... + 30875.

It is an arithmetic number, because the mean of its divisors is an integer number (2919456).

Almost surely, 2^28281765 is an apocalyptic number.

It is an amenable number.

28281765 is a deficient number, since it is larger than the sum of its proper divisors (18429531).

28281765 is a wasteful number, since it uses less digits than its factorization.

28281765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60860.

The product of its digits is 53760, while the sum is 39.

The square root of 28281765 is about 5318.0602666762. The cubic root of 28281765 is about 304.6740762791.

The spelling of 28281765 in words is "twenty-eight million, two hundred eighty-one thousand, seven hundred sixty-five".