8523220 has 12 divisors (see below), whose sum is σ = 17898804. Its totient is φ = 3409280.

The previous prime is 8523211. The next prime is 8523223. The reversal of 8523220 is 223258.

It can be written as a sum of positive squares in 2 ways, for example, as 2676496 + 5846724 = 1636^2 + 2418^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8523191 and 8523200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8523223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213061 + ... + 213100.

It is an arithmetic number, because the mean of its divisors is an integer number (1491567).

Almost surely, 2^8523220 is an apocalyptic number.

It is an amenable number.

8523220 is an abundant number, since it is smaller than the sum of its proper divisors (9375584).

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

8523220 is a wasteful number, since it uses less digits than its factorization.

8523220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426170 (or 426168 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 8523220 is about 2919.4554286716. The cubic root of 8523220 is about 204.2684214885.

Adding to 8523220 its reverse (223258), we get a palindrome (8746478).

The spelling of 8523220 in words is "eight million, five hundred twenty-three thousand, two hundred twenty".