28032927664981 has 2 divisors, whose sum is σ = 28032927664982. Its totient is φ = 28032927664980.

The previous prime is 28032927664853. The next prime is 28032927665077. The reversal of 28032927664981 is 18946672923082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20400886026756 + 7632041638225 = 4516734^2 + 2762615^2 .

It is a cyclic number.

It is not a de Polignac number, because 28032927664981 - 2⁷ = 28032927664853 is a prime.

It is a super-2 number, since 2×28032927664981² (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 (28032927668981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14016463832490 + 14016463832491.

It is an arithmetic number, because the mean of its divisors is an integer number (14016463832491).

Almost surely, 2^{28032927664981} is an apocalyptic number.

It is an amenable number.

28032927664981 is a deficient number, since it is larger than the sum of its proper divisors (1).

28032927664981 is an equidigital number, since it uses as much as digits as its factorization.

28032927664981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125411328, while the sum is 67.

The spelling of 28032927664981 in words is "twenty-eight trillion, thirty-two billion, nine hundred twenty-seven million, six hundred sixty-four thousand, nine hundred eighty-one".