7220618 has 8 divisors (see below), whose sum is σ = 10859940. Its totient is φ = 3600640.

The previous prime is 7220611. The next prime is 7220621. The reversal of 7220618 is 8160227.

It can be written as a sum of positive squares in 2 ways, for example, as 7166329 + 54289 = 2677^2 + 233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (7220611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3863 + ... + 5418.

Almost surely, 2^7220618 is an apocalyptic number.

7220618 is a deficient number, since it is larger than the sum of its proper divisors (3639322).

7220618 is a wasteful number, since it uses less digits than its factorization.

7220618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9672.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 7220618 is about 2687.1207639405. The cubic root of 7220618 is about 193.2820203364.

The spelling of 7220618 in words is "seven million, two hundred twenty thousand, six hundred eighteen".