27728744993 has 2 divisors, whose sum is σ = 27728744994. Its totient is φ = 27728744992.

The previous prime is 27728744987. The next prime is 27728745001. The reversal of 27728744993 is 39944782772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27492292864 + 236452129 = 165808^2 + 15377^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27728744993 is a prime.

It is not a weakly prime, because it can be changed into another prime (27728744293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864372496 + 13864372497.

It is an arithmetic number, because the mean of its divisors is an integer number (13864372497).

Almost surely, 2^27728744993 is an apocalyptic number.

It is an amenable number.

27728744993 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728744993 is an equidigital number, since it uses as much as digits as its factorization.

27728744993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42674688, while the sum is 62.

The spelling of 27728744993 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-four thousand, nine hundred ninety-three".