28565243805 has 32 divisors (see below), whose sum is σ = 52241359104. Its totient is φ = 13056454656.

The previous prime is 28565243801. The next prime is 28565243857. The reversal of 28565243805 is 50834256582.

It is not a de Polignac number, because 28565243805 - 2² = 28565243801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28565243801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 877887 + ... + 909843.

It is an arithmetic number, because the mean of its divisors is an integer number (1632542472).

Almost surely, 2^28565243805 is an apocalyptic number.

It is an amenable number.

28565243805 is a deficient number, since it is larger than the sum of its proper divisors (23676115299).

28565243805 is a wasteful number, since it uses less digits than its factorization.

28565243805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40485.

The product of its (nonzero) digits is 2304000, while the sum is 48.

The spelling of 28565243805 in words is "twenty-eight billion, five hundred sixty-five million, two hundred forty-three thousand, eight hundred five".