28786545 has 12 divisors (see below), whose sum is σ = 49896756. Its totient is φ = 15352800.

The previous prime is 28786523. The next prime is 28786591. The reversal of 28786545 is 54568782.

28786545 is a `hidden beast` number, since 28 + 7 + 86 + 545 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4016016 + 24770529 = 2004^2 + 4977^2 .

It is not a de Polignac number, because 28786545 - 2¹⁰ = 28785521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 639701 = 28786545 / (2 + 8 + 7 + 8 + 6 + 5 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28786545.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319806 + ... + 319895.

It is an arithmetic number, because the mean of its divisors is an integer number (4158063).

Almost surely, 2^28786545 is an apocalyptic number.

It is an amenable number.

28786545 is a deficient number, since it is larger than the sum of its proper divisors (21110211).

28786545 is a wasteful number, since it uses less digits than its factorization.

28786545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639712 (or 639709 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 28786545 is about 5365.3094039393. The cubic root of 28786545 is about 306.4760308301.

The spelling of 28786545 in words is "twenty-eight million, seven hundred eighty-six thousand, five hundred forty-five".