12517728 has 48 divisors (see below), whose sum is σ = 33276096. Its totient is φ = 4119680.

The previous prime is 12517723. The next prime is 12517759. The reversal of 12517728 is 82771521.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12517721) 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, 7183 + ... + 8753.

It is an arithmetic number, because the mean of its divisors is an integer number (693252).

Almost surely, 2^12517728 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 12517728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16638048).

12517728 is an abundant number, since it is smaller than the sum of its proper divisors (20758368).

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

12517728 is a wasteful number, since it uses less digits than its factorization.

12517728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1659 counting only the distinct ones).

The product of its digits is 7840, while the sum is 33.

The square root of 12517728 is about 3538.0401354422. The cubic root of 12517728 is about 232.1891046366.

The spelling of 12517728 in words is "twelve million, five hundred seventeen thousand, seven hundred twenty-eight".