12780646 has 8 divisors (see below), whose sum is σ = 19202040. Its totient is φ = 6379968.

The previous prime is 12780637. The next prime is 12780661. The reversal of 12780646 is 64608721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3531 + ... + 6166.

It is an arithmetic number, because the mean of its divisors is an integer number (2400255).

Almost surely, 2^12780646 is an apocalyptic number.

12780646 is a deficient number, since it is larger than the sum of its proper divisors (6421394).

12780646 is an equidigital number, since it uses as much as digits as its factorization.

12780646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10358.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 12780646 is about 3575.0029370617. The cubic root of 12780646 is about 233.8034607529.

The spelling of 12780646 in words is "twelve million, seven hundred eighty thousand, six hundred forty-six".