7220818 has 32 divisors (see below), whose sum is σ = 12830400. Its totient is φ = 3010560.

The previous prime is 7220803. The next prime is 7220821. The reversal of 7220818 is 8180227.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15858 + ... + 16306.

It is an arithmetic number, because the mean of its divisors is an integer number (400950).

Almost surely, 2^7220818 is an apocalyptic number.

7220818 is a deficient number, since it is larger than the sum of its proper divisors (5609582).

7220818 is a wasteful number, since it uses less digits than its factorization.

7220818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 7220818 is about 2687.1579782365. The cubic root of 7220818 is about 193.2838048580.

The spelling of 7220818 in words is "seven million, two hundred twenty thousand, eight hundred eighteen".