12728826377 has 4 divisors (see below), whose sum is σ = 12741936336. Its totient is φ = 12715716420.

The previous prime is 12728826373. The next prime is 12728826391. The reversal of 12728826377 is 77362882721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77362882721 = 168533 ⋅459037.

It is a cyclic number.

It is not a de Polignac number, because 12728826377 - 2² = 12728826373 is a prime.

It is a super-2 number, since 2×12728826377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12728826373) 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, 6553523 + ... + 6555464.

It is an arithmetic number, because the mean of its divisors is an integer number (3185484084).

Almost surely, 2^12728826377 is an apocalyptic number.

It is an amenable number.

12728826377 is a deficient number, since it is larger than the sum of its proper divisors (13109959).

12728826377 is an equidigital number, since it uses as much as digits as its factorization.

12728826377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13109958.

The product of its digits is 3161088, while the sum is 53.

The spelling of 12728826377 in words is "twelve billion, seven hundred twenty-eight million, eight hundred twenty-six thousand, three hundred seventy-seven".