7281220 has 24 divisors (see below), whose sum is σ = 15398208. Its totient is φ = 2892000.

The previous prime is 7281203. The next prime is 7281223. The reversal of 7281220 is 221827.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 7281191 and 7281200.

It is not an unprimeable number, because it can be changed into a prime (7281223) 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, 1815 + ... + 4225.

It is an arithmetic number, because the mean of its divisors is an integer number (641592).

Almost surely, 2^7281220 is an apocalyptic number.

It is an amenable number.

7281220 is an abundant number, since it is smaller than the sum of its proper divisors (8116988).

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

7281220 is a wasteful number, since it uses less digits than its factorization.

7281220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571 (or 2569 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 7281220 is about 2698.3735842170. The cubic root of 7281220 is about 193.8212474703.

The spelling of 7281220 in words is "seven million, two hundred eighty-one thousand, two hundred twenty".