7228520 has 32 divisors (see below), whose sum is σ = 17516520. Its totient is φ = 2668800.

The previous prime is 7228517. The next prime is 7228523. The reversal of 7228520 is 258227.

It is an interprime number because it is at equal distance from previous prime (7228517) and next prime (7228523).

It can be written as a sum of positive squares in 4 ways, for example, as 5635876 + 1592644 = 2374^2 + 1262^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 7228520.

It is not an unprimeable number, because it can be changed into a prime (7228523) 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 7 ways as a sum of consecutive naturals, for example, 6431 + ... + 7470.

Almost surely, 2^7228520 is an apocalyptic number.

It is an amenable number.

7228520 is an abundant number, since it is smaller than the sum of its proper divisors (10288000).

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

7228520 is a wasteful number, since it uses less digits than its factorization.

7228520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13925 (or 13921 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 7228520 is about 2688.5907089031. The cubic root of 7228520 is about 193.3525017327.

The spelling of 7228520 in words is "seven million, two hundred twenty-eight thousand, five hundred twenty".