28565812216 has 8 divisors (see below), whose sum is σ = 53560897920. Its totient is φ = 14282906104.

The previous prime is 28565812213. The next prime is 28565812237. The reversal of 28565812216 is 61221856582.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28565812213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1785363256 + ... + 1785363271.

It is an arithmetic number, because the mean of its divisors is an integer number (6695112240).

Almost surely, 2^28565812216 is an apocalyptic number.

It is an amenable number.

28565812216 is a deficient number, since it is larger than the sum of its proper divisors (24995085704).

28565812216 is a wasteful number, since it uses less digits than its factorization.

28565812216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570726533 (or 3570726529 counting only the distinct ones).

The product of its digits is 460800, while the sum is 46.

The spelling of 28565812216 in words is "twenty-eight billion, five hundred sixty-five million, eight hundred twelve thousand, two hundred sixteen".