8712820 has 12 divisors (see below), whose sum is σ = 18296964. Its totient is φ = 3485120.

The previous prime is 8712793. The next prime is 8712827. The reversal of 8712820 is 282178.

It can be written as a sum of positive squares in 2 ways, for example, as 4477456 + 4235364 = 2116^2 + 2058^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8712827) 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 3 ways as a sum of consecutive naturals, for example, 217801 + ... + 217840.

It is an arithmetic number, because the mean of its divisors is an integer number (1524747).

Almost surely, 2^8712820 is an apocalyptic number.

It is an amenable number.

8712820 is an abundant number, since it is smaller than the sum of its proper divisors (9584144).

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

8712820 is a wasteful number, since it uses less digits than its factorization.

8712820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435650 (or 435648 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 8712820 is about 2951.7486342844. The cubic root of 8712820 is about 205.7719851192.

Adding to 8712820 its reverse (282178), we get a palindrome (8994998).

The spelling of 8712820 in words is "eight million, seven hundred twelve thousand, eight hundred twenty".