12728720 has 40 divisors (see below), whose sum is σ = 29890944. Its totient is φ = 5040512.

The previous prime is 12728713. The next prime is 12728743. The reversal of 12728720 is 2782721.

It is a tau number, because it is divible by the number of its divisors (40).

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, 7817 + ... + 9303.

Almost surely, 2^12728720 is an apocalyptic number.

12728720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12728720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14945472).

12728720 is an abundant number, since it is smaller than the sum of its proper divisors (17162224).

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

12728720 is a wasteful number, since it uses less digits than its factorization.

12728720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607 (or 1601 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 12728720 is about 3567.7331738795. The cubic root of 12728720 is about 233.4863939054.

The spelling of 12728720 in words is "twelve million, seven hundred twenty-eight thousand, seven hundred twenty".