7321618 has 8 divisors (see below), whose sum is σ = 10995660. Its totient is φ = 3656400.

The previous prime is 7321583. The next prime is 7321619. The reversal of 7321618 is 8161237.

It can be written as a sum of positive squares in 2 ways, for example, as 5726449 + 1595169 = 2393^2 + 1263^2 .

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 (7321619) 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, 568 + ... + 3868.

Almost surely, 2^7321618 is an apocalyptic number.

7321618 is a deficient number, since it is larger than the sum of its proper divisors (3674042).

7321618 is a wasteful number, since it uses less digits than its factorization.

7321618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4412.

The product of its digits is 2016, while the sum is 28.

The square root of 7321618 is about 2705.8488501762. The cubic root of 7321618 is about 194.1790425615.

The spelling of 7321618 in words is "seven million, three hundred twenty-one thousand, six hundred eighteen".