12776444928 has 660 divisors, whose sum is σ = 44711466492. Its totient is φ = 3609722880.

The previous prime is 12776444903. The next prime is 12776444939. The reversal of 12776444928 is 82944467721.

12776444928 is a `hidden beast` number, since 127 + 76 + 4 + 449 + 2 + 8 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 418120704 + 12358324224 = 20448^2 + 111168^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 311620588 + ... + 311620628.

Almost surely, 2^12776444928 is an apocalyptic number.

12776444928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12776444928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22355733246).

12776444928 is an abundant number, since it is smaller than the sum of its proper divisors (31935021564).

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

12776444928 is a wasteful number, since it uses less digits than its factorization.

12776444928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 76 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The spelling of 12776444928 in words is "twelve billion, seven hundred seventy-six million, four hundred forty-four thousand, nine hundred twenty-eight".