7521620520 has 128 divisors (see below), whose sum is σ = 23399792640. Its totient is φ = 1932145920.

The previous prime is 7521620503. The next prime is 7521620521. The reversal of 7521620520 is 250261257.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (7521620521) 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, 825027 + ... + 834093.

It is an arithmetic number, because the mean of its divisors is an integer number (182810880).

Almost surely, 2^7521620520 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 7521620520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11699896320).

7521620520 is an abundant number, since it is smaller than the sum of its proper divisors (15878172120).

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

7521620520 is a wasteful number, since it uses less digits than its factorization.

7521620520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9335 (or 9331 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 7521620520 is about 86727.2766781017. The cubic root of 7521620520 is about 1959.3129377207.

Adding to 7521620520 its reverse (250261257), we get a palindrome (7771881777).

The spelling of 7521620520 in words is "seven billion, five hundred twenty-one million, six hundred twenty thousand, five hundred twenty".