12784520 has 32 divisors (see below), whose sum is σ = 32875200. Its totient is φ = 4383168.

The previous prime is 12784489. The next prime is 12784523. The reversal of 12784520 is 2548721.

It is not an unprimeable number, because it can be changed into a prime (12784523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22550 + ... + 23109.

It is an arithmetic number, because the mean of its divisors is an integer number (1027350).

Almost surely, 2^12784520 is an apocalyptic number.

12784520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12784520 is an abundant number, since it is smaller than the sum of its proper divisors (20090680).

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

12784520 is a wasteful number, since it uses less digits than its factorization.

12784520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45677 (or 45673 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 12784520 is about 3575.5447137464. The cubic root of 12784520 is about 233.8270814449.

The spelling of 12784520 in words is "twelve million, seven hundred eighty-four thousand, five hundred twenty".