28304940856 has 8 divisors (see below), whose sum is σ = 53071764120. Its totient is φ = 14152470424.

The previous prime is 28304940793. The next prime is 28304940863. The reversal of 28304940856 is 65804940382.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1769058796 + ... + 1769058811.

It is an arithmetic number, because the mean of its divisors is an integer number (6633970515).

Almost surely, 2^28304940856 is an apocalyptic number.

It is an amenable number.

28304940856 is a deficient number, since it is larger than the sum of its proper divisors (24766823264).

28304940856 is a wasteful number, since it uses less digits than its factorization.

28304940856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538117613 (or 3538117609 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 28304940856 in words is "twenty-eight billion, three hundred four million, nine hundred forty thousand, eight hundred fifty-six".