28047066073 has 4 divisors (see below), whose sum is σ = 30204532708. Its totient is φ = 25889599440.

The previous prime is 28047066053. The next prime is 28047066083. The reversal of 28047066073 is 37066074082.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1338681744 + 26708384329 = 36588^2 + 163427^2 .

It is a cyclic number.

It is not a de Polignac number, because 28047066073 - 2⁹ = 28047065561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28047066013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078733298 + ... + 1078733323.

It is an arithmetic number, because the mean of its divisors is an integer number (7551133177).

Almost surely, 2^28047066073 is an apocalyptic number.

It is an amenable number.

28047066073 is a deficient number, since it is larger than the sum of its proper divisors (2157466635).

28047066073 is a wasteful number, since it uses less digits than its factorization.

28047066073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157466634.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 28047066073 in words is "twenty-eight billion, forty-seven million, sixty-six thousand, seventy-three".