7457220 has 72 divisors (see below), whose sum is σ = 23960664. Its totient is φ = 1870848.

The previous prime is 7457179. The next prime is 7457231. The reversal of 7457220 is 227547.

7457220 is a `hidden beast` number, since 74 + 572 + 20 = 666.

7457220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3392964 + 4064256 = 1842^2 + 2016^2 .

It is a super-2 number, since 2×7457220² = 111220260256800, which contains 22 as substring.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1842 + ... + 4278.

It is an arithmetic number, because the mean of its divisors is an integer number (332787).

Almost surely, 2^7457220 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 7457220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11980332).

7457220 is an abundant number, since it is smaller than the sum of its proper divisors (16503444).

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

7457220 is a wasteful number, since it uses less digits than its factorization.

7457220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469 (or 2464 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 7457220 is about 2730.7910941703. The cubic root of 7457220 is about 195.3704987647.

The spelling of 7457220 in words is "seven million, four hundred fifty-seven thousand, two hundred twenty".