8531820 has 144 divisors (see below), whose sum is σ = 29352960. Its totient is φ = 1987200.

The previous prime is 8531801. The next prime is 8531821. The reversal of 8531820 is 281358.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (8531821) 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 47 ways as a sum of consecutive naturals, for example, 61311 + ... + 61449.

It is an arithmetic number, because the mean of its divisors is an integer number (203840).

Almost surely, 2^8531820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8531820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14676480).

8531820 is an abundant number, since it is smaller than the sum of its proper divisors (20821140).

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

8531820 is a wasteful number, since it uses less digits than its factorization.

8531820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 8531820 is about 2920.9279347495. The cubic root of 8531820 is about 204.3371012407.

The spelling of 8531820 in words is "eight million, five hundred thirty-one thousand, eight hundred twenty".