28081844785 has 8 divisors (see below), whose sum is σ = 33776041320. Its totient is φ = 22413590784.

The previous prime is 28081844761. The next prime is 28081844797. The reversal of 28081844785 is 58744818082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 645566464 + 27436278321 = 25408^2 + 165639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28081844785 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6483250 + ... + 6487579.

It is an arithmetic number, because the mean of its divisors is an integer number (4222005165).

Almost surely, 2^28081844785 is an apocalyptic number.

It is an amenable number.

28081844785 is a deficient number, since it is larger than the sum of its proper divisors (5694196535).

28081844785 is a wasteful number, since it uses less digits than its factorization.

28081844785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12971267.

The product of its (nonzero) digits is 4587520, while the sum is 55.

The spelling of 28081844785 in words is "twenty-eight billion, eighty-one million, eight hundred forty-four thousand, seven hundred eighty-five".