8728891 has 8 divisors (see below), whose sum is σ = 9160704. Its totient is φ = 8301480.

The previous prime is 8728883. The next prime is 8728897. The reversal of 8728891 is 1988278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8728891 - 2³ = 8728883 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8728897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3400 + ... + 5386.

It is an arithmetic number, because the mean of its divisors is an integer number (1145088).

Almost surely, 2^8728891 is an apocalyptic number.

8728891 is a deficient number, since it is larger than the sum of its proper divisors (431813).

8728891 is a wasteful number, since it uses less digits than its factorization.

8728891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201.

The product of its digits is 64512, while the sum is 43.

The square root of 8728891 is about 2954.4696647622. The cubic root of 8728891 is about 205.8984244885.

The spelling of 8728891 in words is "eight million, seven hundred twenty-eight thousand, eight hundred ninety-one".