12720784 has 20 divisors (see below), whose sum is σ = 24748416. Its totient is φ = 6334112.

The previous prime is 12720781. The next prime is 12720787. The reversal of 12720784 is 48702721.

It is an interprime number because it is at equal distance from previous prime (12720781) and next prime (12720787).

It is not an unprimeable number, because it can be changed into a prime (12720781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2697 + ... + 5719.

Almost surely, 2^12720784 is an apocalyptic number.

It is an amenable number.

12720784 is a deficient number, since it is larger than the sum of its proper divisors (12027632).

12720784 is a wasteful number, since it uses less digits than its factorization.

12720784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3294 (or 3288 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 12720784 is about 3566.6208096741. The cubic root of 12720784 is about 233.4378597442.

The spelling of 12720784 in words is "twelve million, seven hundred twenty thousand, seven hundred eighty-four".