7224420 has 96 divisors (see below), whose sum is σ = 23482368. Its totient is φ = 1625472.

The previous prime is 7224419. The next prime is 7224431. The reversal of 7224420 is 244227.

7224420 is digitally balanced in base 4 and base 5, because in such bases 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 (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43177 + ... + 43343.

It is an arithmetic number, because the mean of its divisors is an integer number (244608).

Almost surely, 2^7224420 is an apocalyptic number.

7224420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7224420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11741184).

7224420 is an abundant number, since it is smaller than the sum of its proper divisors (16257948).

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

7224420 is a wasteful number, since it uses less digits than its factorization.

7224420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 7224420 is about 2687.8281195047. The cubic root of 7224420 is about 193.3159384535.

Adding to 7224420 its reverse (244227), we get a palindrome (7468647).

The spelling of 7224420 in words is "seven million, two hundred twenty-four thousand, four hundred twenty".