7522220 has 24 divisors (see below), whose sum is σ = 15850464. Its totient is φ = 2998656.

The previous prime is 7522217. The next prime is 7522231. The reversal of 7522220 is 222257.

7522220 = 414² + 415² + ... + 453².

7522220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 7522192 and 7522201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8729 + ... + 9551.

It is an arithmetic number, because the mean of its divisors is an integer number (660436).

Almost surely, 2^7522220 is an apocalyptic number.

It is an amenable number.

7522220 is an abundant number, since it is smaller than the sum of its proper divisors (8328244).

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

7522220 is a wasteful number, since it uses less digits than its factorization.

7522220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289 (or 1287 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 7522220 is about 2742.6665856425. Note that the first 3 decimals coincide. The cubic root of 7522220 is about 195.9364989346.

Adding to 7522220 its reverse (222257), we get a palindrome (7744477).

The spelling of 7522220 in words is "seven million, five hundred twenty-two thousand, two hundred twenty".