12777809628 has 12 divisors (see below), whose sum is σ = 29814889160. Its totient is φ = 4259269872.

The previous prime is 12777809623. The next prime is 12777809641. The reversal of 12777809628 is 82690877721.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12777809623) 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, 532408723 + ... + 532408746.

Almost surely, 2^12777809628 is an apocalyptic number.

It is an amenable number.

12777809628 is an abundant number, since it is smaller than the sum of its proper divisors (17037079532).

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

12777809628 is a wasteful number, since it uses less digits than its factorization.

12777809628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064817476 (or 1064817474 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 57.

The spelling of 12777809628 in words is "twelve billion, seven hundred seventy-seven million, eight hundred nine thousand, six hundred twenty-eight".