28856766813 has 16 divisors (see below), whose sum is σ = 43975456896. Its totient is φ = 16488365760.

The previous prime is 28856766779. The next prime is 28856766877. The reversal of 28856766813 is 31866765882.

It is not a de Polignac number, because 28856766813 - 2⁶ = 28856766749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28856766893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296395 + ... + 381527.

It is an arithmetic number, because the mean of its divisors is an integer number (2748466056).

Almost surely, 2^28856766813 is an apocalyptic number.

It is an amenable number.

28856766813 is a deficient number, since it is larger than the sum of its proper divisors (15118690083).

28856766813 is a wasteful number, since it uses less digits than its factorization.

28856766813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101284.

The product of its digits is 23224320, while the sum is 60.

The spelling of 28856766813 in words is "twenty-eight billion, eight hundred fifty-six million, seven hundred sixty-six thousand, eight hundred thirteen".