12777928638 has 8 divisors (see below), whose sum is σ = 25555857288. Its totient is φ = 4259309544.

The previous prime is 12777928619. The next prime is 12777928643. The reversal of 12777928638 is 83682977721.

It is a sphenic number, since it is the product of 3 distinct primes.

12777928638 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064827381 + ... + 1064827392.

It is an arithmetic number, because the mean of its divisors is an integer number (3194482161).

Almost surely, 2^12777928638 is an apocalyptic number.

12777928638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12777928638 is a wasteful number, since it uses less digits than its factorization.

12777928638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129654778.

The product of its digits is 14224896, while the sum is 60.

The spelling of 12777928638 in words is "twelve billion, seven hundred seventy-seven million, nine hundred twenty-eight thousand, six hundred thirty-eight".