8216520 has 128 divisors (see below), whose sum is σ = 27820800. Its totient is φ = 1926144.

The previous prime is 8216503. The next prime is 8216521. The reversal of 8216520 is 256128.

It is a super-2 number, since 2×8216520² = 135022401820800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (8216521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35766 + ... + 35994.

It is an arithmetic number, because the mean of its divisors is an integer number (217350).

Almost surely, 2^8216520 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 8216520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13910400).

8216520 is an abundant number, since it is smaller than the sum of its proper divisors (19604280).

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

8216520 is a wasteful number, since it uses less digits than its factorization.

8216520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 8216520 is about 2866.4472784267. The cubic root of 8216520 is about 201.7882956682.

The spelling of 8216520 in words is "eight million, two hundred sixteen thousand, five hundred twenty".