12780992 has 56 divisors (see below), whose sum is σ = 29650944. Its totient is φ = 5352192.

The previous prime is 12780983. The next prime is 12781007. The reversal of 12780992 is 29908721.

It is a tau number, because it is divible by the number of its divisors (56).

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, 20753 + ... + 21359.

Almost surely, 2^12780992 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 12780992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14825472).

12780992 is an abundant number, since it is smaller than the sum of its proper divisors (16869952).

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

12780992 is an equidigital number, since it uses as much as digits as its factorization.

12780992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 12780992 is about 3575.0513283029. The cubic root of 12780992 is about 233.8055705907.

The spelling of 12780992 in words is "twelve million, seven hundred eighty thousand, nine hundred ninety-two".