28138644683231 has 2 divisors, whose sum is σ = 28138644683232. Its totient is φ = 28138644683230.

The previous prime is 28138644683143. The next prime is 28138644683287. The reversal of 28138644683231 is 13238644683182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28138644683231 is a prime.

It is a super-2 number, since 2×28138644683231² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28138644683131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14069322341615 + 14069322341616.

It is an arithmetic number, because the mean of its divisors is an integer number (14069322341616).

Almost surely, 2^{28138644683231} is an apocalyptic number.

28138644683231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28138644683231 is an equidigital number, since it uses as much as digits as its factorization.

28138644683231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31850496, while the sum is 59.

The spelling of 28138644683231 in words is "twenty-eight trillion, one hundred thirty-eight billion, six hundred forty-four million, six hundred eighty-three thousand, two hundred thirty-one".