28786365 has 12 divisors (see below), whose sum is σ = 49896444. Its totient is φ = 15352704.

The previous prime is 28786343. The next prime is 28786397. The reversal of 28786365 is 56368782.

28786365 is a `hidden beast` number, since 2 + 8 + 7 + 8 + 636 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21958596 + 6827769 = 4686^2 + 2613^2 .

It is not a de Polignac number, because 28786365 - 2⁶ = 28786301 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: 639697 = 28786365 / (2 + 8 + 7 + 8 + 6 + 3 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28786365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319804 + ... + 319893.

It is an arithmetic number, because the mean of its divisors is an integer number (4158037).

Almost surely, 2^28786365 is an apocalyptic number.

It is an amenable number.

28786365 is a deficient number, since it is larger than the sum of its proper divisors (21110079).

28786365 is a wasteful number, since it uses less digits than its factorization.

28786365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639708 (or 639705 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28786365 is about 5365.2926294844. The cubic root of 28786365 is about 306.4753920386.

The spelling of 28786365 in words is "twenty-eight million, seven hundred eighty-six thousand, three hundred sixty-five".