28376581033981 has 2 divisors, whose sum is σ = 28376581033982. Its totient is φ = 28376581033980.

The previous prime is 28376581033949. The next prime is 28376581034051. The reversal of 28376581033981 is 18933018567382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24948936101881 + 3427644932100 = 4994891^2 + 1851390^2 .

It is a cyclic number.

It is not a de Polignac number, because 28376581033981 - 2⁵ = 28376581033949 is a prime.

It is a super-2 number, since 2×28376581033981² (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 (28376581033921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14188290516990 + 14188290516991.

It is an arithmetic number, because the mean of its divisors is an integer number (14188290516991).

Almost surely, 2^{28376581033981} is an apocalyptic number.

It is an amenable number.

28376581033981 is a deficient number, since it is larger than the sum of its proper divisors (1).

28376581033981 is an equidigital number, since it uses as much as digits as its factorization.

28376581033981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52254720, while the sum is 64.

The spelling of 28376581033981 in words is "twenty-eight trillion, three hundred seventy-six billion, five hundred eighty-one million, thirty-three thousand, nine hundred eighty-one".