12779648 has 64 divisors (see below), whose sum is σ = 30844800. Its totient is φ = 5148672.

The previous prime is 12779639. The next prime is 12779671. The reversal of 12779648 is 84697721.

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

It is a junction number, because it is equal to n+sod(n) for n = 12779599 and 12779608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14813 + ... + 15651.

It is an arithmetic number, because the mean of its divisors is an integer number (481950).

Almost surely, 2^12779648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12779648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15422400).

12779648 is an abundant number, since it is smaller than the sum of its proper divisors (18065152).

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

12779648 is an equidigital number, since it uses as much as digits as its factorization.

12779648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877 (or 865 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The square root of 12779648 is about 3574.8633540319. The cubic root of 12779648 is about 233.7973749383.

The spelling of 12779648 in words is "twelve million, seven hundred seventy-nine thousand, six hundred forty-eight".