28681000511 has 4 divisors (see below), whose sum is σ = 28687900800. Its totient is φ = 28674100224.

The previous prime is 28681000507. The next prime is 28681000519. The reversal of 28681000511 is 11500018682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11500018682 = 2 ⋅5750009341.

It is a cyclic number.

It is not a de Polignac number, because 28681000511 - 2² = 28681000507 is a prime.

It is a super-2 number, since 2×28681000511² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28681000519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3443906 + ... + 3452223.

It is an arithmetic number, because the mean of its divisors is an integer number (7171975200).

Almost surely, 2^28681000511 is an apocalyptic number.

28681000511 is a deficient number, since it is larger than the sum of its proper divisors (6900289).

28681000511 is an equidigital number, since it uses as much as digits as its factorization.

28681000511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6900288.

The product of its (nonzero) digits is 3840, while the sum is 32.

The spelling of 28681000511 in words is "twenty-eight billion, six hundred eighty-one million, five hundred eleven", and thus it is an aban number.