28073378849 has 2 divisors, whose sum is σ = 28073378850. Its totient is φ = 28073378848.

The previous prime is 28073378843. The next prime is 28073378857. The reversal of 28073378849 is 94887337082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14058370624 + 14015008225 = 118568^2 + 118385^2 .

It is a cyclic number.

It is not a de Polignac number, because 28073378849 - 2⁴ = 28073378833 is a prime.

It is a super-2 number, since 2×28073378849² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28073378843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14036689424 + 14036689425.

It is an arithmetic number, because the mean of its divisors is an integer number (14036689425).

Almost surely, 2^28073378849 is an apocalyptic number.

It is an amenable number.

28073378849 is a deficient number, since it is larger than the sum of its proper divisors (1).

28073378849 is an equidigital number, since it uses as much as digits as its factorization.

28073378849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16257024, while the sum is 59.

The spelling of 28073378849 in words is "twenty-eight billion, seventy-three million, three hundred seventy-eight thousand, eight hundred forty-nine".