28252343881 has 2 divisors, whose sum is σ = 28252343882. Its totient is φ = 28252343880.

The previous prime is 28252343851. The next prime is 28252343891. The reversal of 28252343881 is 18834325282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16471412281 + 11780931600 = 128341^2 + 108540^2 .

It is a cyclic number.

It is not a de Polignac number, because 28252343881 - 2⁵ = 28252343849 is a prime.

It is a super-3 number, since 3×28252343881³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (28252343831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14126171940 + 14126171941.

It is an arithmetic number, because the mean of its divisors is an integer number (14126171941).

Almost surely, 2^28252343881 is an apocalyptic number.

It is an amenable number.

28252343881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28252343881 is an equidigital number, since it uses as much as digits as its factorization.

28252343881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 737280, while the sum is 46.

The spelling of 28252343881 in words is "twenty-eight billion, two hundred fifty-two million, three hundred forty-three thousand, eight hundred eighty-one".