28390087549 has 2 divisors, whose sum is σ = 28390087550. Its totient is φ = 28390087548.

The previous prime is 28390087541. The next prime is 28390087589. The reversal of 28390087549 is 94578009382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19906388100 + 8483699449 = 141090^2 + 92107^2 .

It is a cyclic number.

It is not a de Polignac number, because 28390087549 - 2³ = 28390087541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28390087549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28390087541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14195043774 + 14195043775.

It is an arithmetic number, because the mean of its divisors is an integer number (14195043775).

Almost surely, 2^28390087549 is an apocalyptic number.

It is an amenable number.

28390087549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28390087549 is an equidigital number, since it uses as much as digits as its factorization.

28390087549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 28390087549 in words is "twenty-eight billion, three hundred ninety million, eighty-seven thousand, five hundred forty-nine".