8709728 has 12 divisors (see below), whose sum is σ = 17147340. Its totient is φ = 4354848.

The previous prime is 8709721. The next prime is 8709731. The reversal of 8709728 is 8279078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8709721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136058 + ... + 136121.

It is an arithmetic number, because the mean of its divisors is an integer number (1428945).

Almost surely, 2^8709728 is an apocalyptic number.

It is an amenable number.

8709728 is a deficient number, since it is larger than the sum of its proper divisors (8437612).

8709728 is a wasteful number, since it uses less digits than its factorization.

8709728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272189 (or 272181 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 8709728 is about 2951.2248304729. The cubic root of 8709728 is about 205.7476408289.

The spelling of 8709728 in words is "eight million, seven hundred nine thousand, seven hundred twenty-eight".