28148204565 has 64 divisors (see below), whose sum is σ = 53920339200. Its totient is φ = 13849926912.

The previous prime is 28148204533. The next prime is 28148204599. The reversal of 28148204565 is 56540284182.

28148204565 is a `hidden beast` number, since 2 + 8 + 1 + 4 + 82 + 0 + 4 + 565 = 666.

It is not a de Polignac number, because 28148204565 - 2⁵ = 28148204533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28148204565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4452787 + ... + 4459103.

It is an arithmetic number, because the mean of its divisors is an integer number (842505300).

Almost surely, 2^28148204565 is an apocalyptic number.

It is an amenable number.

28148204565 is a deficient number, since it is larger than the sum of its proper divisors (25772134635).

28148204565 is a wasteful number, since it uses less digits than its factorization.

28148204565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8883 (or 8877 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 28148204565 in words is "twenty-eight billion, one hundred forty-eight million, two hundred four thousand, five hundred sixty-five".