28093724081 has 2 divisors, whose sum is σ = 28093724082. Its totient is φ = 28093724080.

The previous prime is 28093724063. The next prime is 28093724089. The reversal of 28093724081 is 18042739082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28089760000 + 3964081 = 167600^2 + 1991^2 .

It is a cyclic number.

It is not a de Polignac number, because 28093724081 - 2²⁶ = 28026615217 is a prime.

It is a super-2 number, since 2×28093724081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28093724089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14046862040 + 14046862041.

It is an arithmetic number, because the mean of its divisors is an integer number (14046862041).

Almost surely, 2^28093724081 is an apocalyptic number.

It is an amenable number.

28093724081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28093724081 is an equidigital number, since it uses as much as digits as its factorization.

28093724081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 28093724081 in words is "twenty-eight billion, ninety-three million, seven hundred twenty-four thousand, eighty-one".