8720847 has 12 divisors (see below), whose sum is σ = 13338000. Its totient is φ = 5471808.

The previous prime is 8720839. The next prime is 8720891. The reversal of 8720847 is 7480278.

It is not a de Polignac number, because 8720847 - 2³ = 8720839 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 (8720807) 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 11 ways as a sum of consecutive naturals, for example, 28347 + ... + 28652.

It is an arithmetic number, because the mean of its divisors is an integer number (1111500).

Almost surely, 2^8720847 is an apocalyptic number.

8720847 is a deficient number, since it is larger than the sum of its proper divisors (4617153).

8720847 is a wasteful number, since it uses less digits than its factorization.

8720847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57022 (or 57019 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 8720847 is about 2953.1080237607. The cubic root of 8720847 is about 205.8351573468.

The spelling of 8720847 in words is "eight million, seven hundred twenty thousand, eight hundred forty-seven".