28112645881 has 2 divisors, whose sum is σ = 28112645882. Its totient is φ = 28112645880.

The previous prime is 28112645863. The next prime is 28112645927. The reversal of 28112645881 is 18854621182.

It is a happy number.

It is an a-pointer prime, because the next prime (28112645927) can be obtained adding 28112645881 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27164313856 + 948332025 = 164816^2 + 30795^2 .

It is a cyclic number.

It is not a de Polignac number, because 28112645881 - 2¹³ = 28112637689 is a prime.

It is a super-2 number, since 2×28112645881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28112645851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14056322940 + 14056322941.

It is an arithmetic number, because the mean of its divisors is an integer number (14056322941).

Almost surely, 2^28112645881 is an apocalyptic number.

It is an amenable number.

28112645881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28112645881 is an equidigital number, since it uses as much as digits as its factorization.

28112645881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 245760, while the sum is 46.

The spelling of 28112645881 in words is "twenty-eight billion, one hundred twelve million, six hundred forty-five thousand, eight hundred eighty-one".