7220555 has 4 divisors (see below), whose sum is σ = 8664672. Its totient is φ = 5776440.

The previous prime is 7220531. The next prime is 7220557. The reversal of 7220555 is 5550227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5550227 = 1013 ⋅5479.

It is not a de Polignac number, because 7220555 - 2⁶ = 7220491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7220557) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 722051 + ... + 722060.

It is an arithmetic number, because the mean of its divisors is an integer number (2166168).

Almost surely, 2^7220555 is an apocalyptic number.

7220555 is a deficient number, since it is larger than the sum of its proper divisors (1444117).

7220555 is a wasteful number, since it uses less digits than its factorization.

7220555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444116.

The product of its (nonzero) digits is 3500, while the sum is 26.

The square root of 7220555 is about 2687.1090413305. The cubic root of 7220555 is about 193.2814582053.

The spelling of 7220555 in words is "seven million, two hundred twenty thousand, five hundred fifty-five".