8728581 has 8 divisors (see below), whose sum is σ = 12250720. Its totient is φ = 5512752.

The previous prime is 8728579. The next prime is 8728591. The reversal of 8728581 is 1858278.

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

It is not a de Polignac number, because 8728581 - 2¹ = 8728579 is a prime.

It is a super-2 number, since 2×8728581² = 152376252547122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8728571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76510 + ... + 76623.

It is an arithmetic number, because the mean of its divisors is an integer number (1531340).

Almost surely, 2^8728581 is an apocalyptic number.

It is an amenable number.

8728581 is a deficient number, since it is larger than the sum of its proper divisors (3522139).

8728581 is a wasteful number, since it uses less digits than its factorization.

8728581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153155.

The product of its digits is 35840, while the sum is 39.

The square root of 8728581 is about 2954.4172014121. The cubic root of 8728581 is about 205.8959870171.

It can be divided in two parts, 872 and 8581, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 8728581 in words is "eight million, seven hundred twenty-eight thousand, five hundred eighty-one".