27728587589 has 2 divisors, whose sum is σ = 27728587590. Its totient is φ = 27728587588.

The previous prime is 27728587567. The next prime is 27728587657. The reversal of 27728587589 is 98578582772.

It is a happy number.

It is an a-pointer prime, because the next prime (27728587657) can be obtained adding 27728587589 to its sum of digits (68).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25618563364 + 2110024225 = 160058^2 + 45935^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728587589 - 2¹⁶ = 27728522053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27728587489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864293794 + 13864293795.

It is an arithmetic number, because the mean of its divisors is an integer number (13864293795).

Almost surely, 2^27728587589 is an apocalyptic number.

It is an amenable number.

27728587589 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728587589 is an equidigital number, since it uses as much as digits as its factorization.

27728587589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158054400, while the sum is 68.

The spelling of 27728587589 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred eighty-seven thousand, five hundred eighty-nine".