8720523 has 24 divisors (see below), whose sum is σ = 14508000. Its totient is φ = 4944384.

The previous prime is 8720513. The next prime is 8720531. The reversal of 8720523 is 3250278.

It is not a de Polignac number, because 8720523 - 2²¹ = 6623371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8720513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8923 + ... + 9851.

It is an arithmetic number, because the mean of its divisors is an integer number (604500).

Almost surely, 2^8720523 is an apocalyptic number.

8720523 is a deficient number, since it is larger than the sum of its proper divisors (5787477).

8720523 is a wasteful number, since it uses less digits than its factorization.

8720523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 8720523 is about 2953.0531657930. The cubic root of 8720523 is about 205.8326082283.

The spelling of 8720523 in words is "eight million, seven hundred twenty thousand, five hundred twenty-three".