8720647 has 8 divisors (see below), whose sum is σ = 9419760. Its totient is φ = 8025600.

The previous prime is 8720629. The next prime is 8720671. The reversal of 8720647 is 7460278.

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 8720647 - 2¹⁵ = 8687879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720617) 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, 4647 + ... + 6247.

It is an arithmetic number, because the mean of its divisors is an integer number (1177470).

Almost surely, 2^8720647 is an apocalyptic number.

8720647 is a deficient number, since it is larger than the sum of its proper divisors (699113).

8720647 is a wasteful number, since it uses less digits than its factorization.

8720647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 8720647 is about 2953.0741609381. The cubic root of 8720647 is about 205.8335838243.

The spelling of 8720647 in words is "eight million, seven hundred twenty thousand, six hundred forty-seven".