28056124991 has 2 divisors, whose sum is σ = 28056124992. Its totient is φ = 28056124990.

The previous prime is 28056124979. The next prime is 28056125011. The reversal of 28056124991 is 19942165082.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28056124991 - 2⁶ = 28056124927 is a prime.

It is a super-2 number, since 2×28056124991² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28056124931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028062495 + 14028062496.

It is an arithmetic number, because the mean of its divisors is an integer number (14028062496).

Almost surely, 2^28056124991 is an apocalyptic number.

28056124991 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056124991 is an equidigital number, since it uses as much as digits as its factorization.

28056124991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 28056124991 in words is "twenty-eight billion, fifty-six million, one hundred twenty-four thousand, nine hundred ninety-one".