12777216 has 72 divisors (see below), whose sum is σ = 34535424. Its totient is φ = 4193280.

The previous prime is 12777209. The next prime is 12777221. The reversal of 12777216 is 61277721.

It is a happy number.

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, 97471 + ... + 97601.

Almost surely, 2^12777216 is an apocalyptic number.

12777216 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 12777216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17267712).

12777216 is an abundant number, since it is smaller than the sum of its proper divisors (21758208).

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

12777216 is a wasteful number, since it uses less digits than its factorization.

12777216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 263 counting only the distinct ones).

The product of its digits is 8232, while the sum is 33.

The square root of 12777216 is about 3574.5231849857. The cubic root of 12777216 is about 233.7825432495.

The spelling of 12777216 in words is "twelve million, seven hundred seventy-seven thousand, two hundred sixteen".