8521520 has 40 divisors (see below), whose sum is σ = 22644384. Its totient is φ = 2921472.

The previous prime is 8521501. The next prime is 8521561. The reversal of 8521520 is 251258.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×8521520² = 145232606220800, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7049 + ... + 8168.

Almost surely, 2^8521520 is an apocalyptic number.

8521520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8521520 is an abundant number, since it is smaller than the sum of its proper divisors (14122864).

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

8521520 is a wasteful number, since it uses less digits than its factorization.

8521520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15237 (or 15231 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 8521520 is about 2919.1642639632. The cubic root of 8521520 is about 204.2548397903.

Adding to 8521520 its reverse (251258), we get a palindrome (8772778).

The spelling of 8521520 in words is "eight million, five hundred twenty-one thousand, five hundred twenty".