8728661 has 8 divisors (see below), whose sum is σ = 9180864. Its totient is φ = 8282560.

The previous prime is 8728649. The next prime is 8728663. The reversal of 8728661 is 1668278.

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 8728661 - 2⁶ = 8728597 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8728663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1565 + ... + 4461.

It is an arithmetic number, because the mean of its divisors is an integer number (1147608).

Almost surely, 2^8728661 is an apocalyptic number.

It is an amenable number.

8728661 is a deficient number, since it is larger than the sum of its proper divisors (452203).

8728661 is a wasteful number, since it uses less digits than its factorization.

8728661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3051.

The product of its digits is 32256, while the sum is 38.

The square root of 8728661 is about 2954.4307404304. The cubic root of 8728661 is about 205.8966160475.

The spelling of 8728661 in words is "eight million, seven hundred twenty-eight thousand, six hundred sixty-one".