8728161 has 16 divisors (see below), whose sum is σ = 12618816. Its totient is φ = 5334336.

The previous prime is 8728147. The next prime is 8728169. The reversal of 8728161 is 1618278.

It is a happy number.

8728161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8728161 - 2⁵ = 8728129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8728169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5671 + ... + 7043.

It is an arithmetic number, because the mean of its divisors is an integer number (788676).

Almost surely, 2^8728161 is an apocalyptic number.

It is an amenable number.

8728161 is a deficient number, since it is larger than the sum of its proper divisors (3890655).

8728161 is a wasteful number, since it uses less digits than its factorization.

8728161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552.

The product of its digits is 5376, while the sum is 33.

The square root of 8728161 is about 2954.3461205485. The cubic root of 8728161 is about 205.8926845444.

The spelling of 8728161 in words is "eight million, seven hundred twenty-eight thousand, one hundred sixty-one".