12787656 has 64 divisors (see below), whose sum is σ = 36940800. Its totient is φ = 3613248.

The previous prime is 12787639. The next prime is 12787667. The reversal of 12787656 is 65678721.

12787656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16935 + ... + 17673.

It is an arithmetic number, because the mean of its divisors is an integer number (577200).

Almost surely, 2^12787656 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 12787656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18470400).

12787656 is an abundant number, since it is smaller than the sum of its proper divisors (24153144).

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

12787656 is a wasteful number, since it uses less digits than its factorization.

12787656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858 (or 854 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 12787656 is about 3575.9832214371. The cubic root of 12787656 is about 233.8461988822.

The spelling of 12787656 in words is "twelve million, seven hundred eighty-seven thousand, six hundred fifty-six".