12628787779 has 4 divisors (see below), whose sum is σ = 13293460840. Its totient is φ = 11964114720.

The previous prime is 12628787771. The next prime is 12628787791. The reversal of 12628787779 is 97778782621.

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

It is a cyclic number.

It is not a de Polignac number, because 12628787779 - 2³ = 12628787771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12628787779.

It is not an unprimeable number, because it can be changed into a prime (12628787771) 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, 332336502 + ... + 332336539.

It is an arithmetic number, because the mean of its divisors is an integer number (3323365210).

Almost surely, 2^12628787779 is an apocalyptic number.

12628787779 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12628787779 is a deficient number, since it is larger than the sum of its proper divisors (664673061).

12628787779 is an equidigital number, since it uses as much as digits as its factorization.

12628787779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664673060.

The product of its digits is 33191424, while the sum is 64.

The spelling of 12628787779 in words is "twelve billion, six hundred twenty-eight million, seven hundred eighty-seven thousand, seven hundred seventy-nine".