28071899549 has 2 divisors, whose sum is σ = 28071899550. Its totient is φ = 28071899548.

The previous prime is 28071899521. The next prime is 28071899561. The reversal of 28071899549 is 94599817082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16200707524 + 11871192025 = 127282^2 + 108955^2 .

It is a cyclic number.

It is not a de Polignac number, because 28071899549 - 2¹⁶ = 28071834013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28071899491 and 28071899500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28071899509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14035949774 + 14035949775.

It is an arithmetic number, because the mean of its divisors is an integer number (14035949775).

Almost surely, 2^28071899549 is an apocalyptic number.

It is an amenable number.

28071899549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28071899549 is an equidigital number, since it uses as much as digits as its factorization.

28071899549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 62.

The spelling of 28071899549 in words is "twenty-eight billion, seventy-one million, eight hundred ninety-nine thousand, five hundred forty-nine".