8720530 has 72 divisors (see below), whose sum is σ = 20210148. Its totient is φ = 2685312.

The previous prime is 8720513. The next prime is 8720531. The reversal of 8720530 is 350278.

It can be written as a sum of positive squares in 6 ways, for example, as 5968249 + 2752281 = 2443^2 + 1659^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8720495 and 8720504.

It is not an unprimeable number, because it can be changed into a prime (8720531) 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 35 ways as a sum of consecutive naturals, for example, 235672 + ... + 235708.

Almost surely, 2^8720530 is an apocalyptic number.

8720530 is an abundant number, since it is smaller than the sum of its proper divisors (11489618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8720530 is a wasteful number, since it uses less digits than its factorization.

8720530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 8720530 is about 2953.0543510068. The cubic root of 8720530 is about 205.8326633025.

The spelling of 8720530 in words is "eight million, seven hundred twenty thousand, five hundred thirty".