8729128 has 16 divisors (see below), whose sum is σ = 16416000. Its totient is φ = 4351536.

The previous prime is 8729117. The next prime is 8729131. The reversal of 8729128 is 8219278.

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, 1593 + ... + 4471.

It is an arithmetic number, because the mean of its divisors is an integer number (1026000).

Almost surely, 2^8729128 is an apocalyptic number.

It is an amenable number.

8729128 is a deficient number, since it is larger than the sum of its proper divisors (7686872).

8729128 is a wasteful number, since it uses less digits than its factorization.

8729128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264 (or 3260 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 8729128 is about 2954.5097732111. The cubic root of 8729128 is about 205.9002879358.

It can be divided in two parts, 872 and 9128, that added together give a 4-th power (10000 = 10⁴).

The spelling of 8729128 in words is "eight million, seven hundred twenty-nine thousand, one hundred twenty-eight".