28000844681 has 2 divisors, whose sum is σ = 28000844682. Its totient is φ = 28000844680.

The previous prime is 28000844657. The next prime is 28000844717. The reversal of 28000844681 is 18644800082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20346169600 + 7654675081 = 142640^2 + 87491^2 .

It is a cyclic number.

It is not a de Polignac number, because 28000844681 - 2⁶ = 28000844617 is a prime.

It is a super-2 number, since 2×28000844681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28000844281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000422340 + 14000422341.

It is an arithmetic number, because the mean of its divisors is an integer number (14000422341).

Almost surely, 2^28000844681 is an apocalyptic number.

It is an amenable number.

28000844681 is a deficient number, since it is larger than the sum of its proper divisors (1).

28000844681 is an equidigital number, since it uses as much as digits as its factorization.

28000844681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98304, while the sum is 41.

The spelling of 28000844681 in words is "twenty-eight billion, eight hundred forty-four thousand, six hundred eighty-one".