28437688849 has 2 divisors, whose sum is σ = 28437688850. Its totient is φ = 28437688848.

The previous prime is 28437688817. The next prime is 28437688861. The reversal of 28437688849 is 94888673482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25166649600 + 3271039249 = 158640^2 + 57193^2 .

It is a cyclic number.

It is not a de Polignac number, because 28437688849 - 2⁵ = 28437688817 is a prime.

It is not a weakly prime, because it can be changed into another prime (28437688879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14218844424 + 14218844425.

It is an arithmetic number, because the mean of its divisors is an integer number (14218844425).

Almost surely, 2^28437688849 is an apocalyptic number.

It is an amenable number.

28437688849 is a deficient number, since it is larger than the sum of its proper divisors (1).

28437688849 is an equidigital number, since it uses as much as digits as its factorization.

28437688849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148635648, while the sum is 67.

The spelling of 28437688849 in words is "twenty-eight billion, four hundred thirty-seven million, six hundred eighty-eight thousand, eight hundred forty-nine".