12728386073 has 4 divisors (see below), whose sum is σ = 13707492708. Its totient is φ = 11749279440.

The previous prime is 12728386057. The next prime is 12728386123. The reversal of 12728386073 is 37068382721.

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 7918686169 + 4809699904 = 88987^2 + 69352^2 .

It is a cyclic number.

It is not a de Polignac number, because 12728386073 - 2⁴ = 12728386057 is a prime.

It is a super-2 number, since 2×12728386073² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12728386003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489553298 + ... + 489553323.

It is an arithmetic number, because the mean of its divisors is an integer number (3426873177).

Almost surely, 2^12728386073 is an apocalyptic number.

12728386073 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12728386073 is a deficient number, since it is larger than the sum of its proper divisors (979106635).

12728386073 is an equidigital number, since it uses as much as digits as its factorization.

12728386073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979106634.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 12728386073 in words is "twelve billion, seven hundred twenty-eight million, three hundred eighty-six thousand, seventy-three".