8728105 has 4 divisors (see below), whose sum is σ = 10473732. Its totient is φ = 6982480.

The previous prime is 8728079. The next prime is 8728129. The reversal of 8728105 is 5018278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5234944 + 3493161 = 2288^2 + 1869^2 .

It is not a de Polignac number, because 8728105 - 2⁵ = 8728073 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 872806 + ... + 872815.

It is an arithmetic number, because the mean of its divisors is an integer number (2618433).

Almost surely, 2^8728105 is an apocalyptic number.

It is an amenable number.

8728105 is a deficient number, since it is larger than the sum of its proper divisors (1745627).

8728105 is a wasteful number, since it uses less digits than its factorization.

8728105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745626.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 8728105 is about 2954.3366429708. The cubic root of 8728105 is about 205.8922442067.

The spelling of 8728105 in words is "eight million, seven hundred twenty-eight thousand, one hundred five".