28748565 has 12 divisors (see below), whose sum is σ = 49830924. Its totient is φ = 15332544.

The previous prime is 28748543. The next prime is 28748579. The reversal of 28748565 is 56584782.

28748565 is a `hidden beast` number, since 2 + 87 + 4 + 8 + 565 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9326916 + 19421649 = 3054^2 + 4407^2 .

It is not a de Polignac number, because 28748565 - 2¹⁰ = 28747541 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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: 638857 = 28748565 / (2 + 8 + 7 + 4 + 8 + 5 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28748565.

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, 319384 + ... + 319473.

It is an arithmetic number, because the mean of its divisors is an integer number (4152577).

Almost surely, 2^28748565 is an apocalyptic number.

It is an amenable number.

28748565 is a deficient number, since it is larger than the sum of its proper divisors (21082359).

28748565 is a wasteful number, since it uses less digits than its factorization.

28748565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638868 (or 638865 counting only the distinct ones).

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

The square root of 28748565 is about 5361.7688312720. The cubic root of 28748565 is about 306.3411867848.

The spelling of 28748565 in words is "twenty-eight million, seven hundred forty-eight thousand, five hundred sixty-five".