12170728 has 16 divisors (see below), whose sum is σ = 22865760. Its totient is φ = 6073200.

The previous prime is 12170713. The next prime is 12170771. The reversal of 12170728 is 82707121.

It is a junction number, because it is equal to n+sod(n) for n = 12170696 and 12170705.

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, 3843 + ... + 6253.

It is an arithmetic number, because the mean of its divisors is an integer number (1429110).

Almost surely, 2^12170728 is an apocalyptic number.

It is an amenable number.

12170728 is a deficient number, since it is larger than the sum of its proper divisors (10695032).

12170728 is a wasteful number, since it uses less digits than its factorization.

12170728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3048 (or 3044 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 12170728 is about 3488.6570482064. The cubic root of 12170728 is about 230.0234884645.

Adding to 12170728 its reverse (82707121), we get a palindrome (94877849).

The spelling of 12170728 in words is "twelve million, one hundred seventy thousand, seven hundred twenty-eight".