12777856 has 64 divisors (see below), whose sum is σ = 31358880. Its totient is φ = 5050368.

The previous prime is 12777827. The next prime is 12777889. The reversal of 12777856 is 65877721.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11100 + ... + 12196.

Almost surely, 2^12777856 is an apocalyptic number.

12777856 is a gapful number since it is divisible by the number (16) 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 12777856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15679440).

12777856 is an abundant number, since it is smaller than the sum of its proper divisors (18581024).

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

12777856 is a wasteful number, since it uses less digits than its factorization.

12777856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131 (or 1119 counting only the distinct ones).

The product of its digits is 164640, while the sum is 43.

The square root of 12777856 is about 3574.6127062942. The cubic root of 12777856 is about 233.7864465079.

The spelling of 12777856 in words is "twelve million, seven hundred seventy-seven thousand, eight hundred fifty-six".