8712320 has 32 divisors (see below), whose sum is σ = 20829420. Its totient is φ = 3484672.

The previous prime is 8712311. The next prime is 8712323. The reversal of 8712320 is 232178.

It can be written as a sum of positive squares in 2 ways, for example, as 7011904 + 1700416 = 2648^2 + 1304^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (8712323) 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 3 ways as a sum of consecutive naturals, for example, 6167 + ... + 7446.

Almost surely, 2^8712320 is an apocalyptic number.

8712320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8712320 is an abundant number, since it is smaller than the sum of its proper divisors (12117100).

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

8712320 is a wasteful number, since it uses less digits than its factorization.

8712320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13632 (or 13620 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 8712320 is about 2951.6639375105. The cubic root of 8712320 is about 205.7680488520.

Adding to 8712320 its reverse (232178), we get a palindrome (8944498).

The spelling of 8712320 in words is "eight million, seven hundred twelve thousand, three hundred twenty".