7287218 has 4 divisors (see below), whose sum is σ = 10930830. Its totient is φ = 3643608.

The previous prime is 7287211. The next prime is 7287229. The reversal of 7287218 is 8127827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7252249 + 34969 = 2693^2 + 187^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7287211) 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 as a sum of consecutive naturals, namely, 1821803 + ... + 1821806.

Almost surely, 2^7287218 is an apocalyptic number.

7287218 is a deficient number, since it is larger than the sum of its proper divisors (3643612).

7287218 is a wasteful number, since it uses less digits than its factorization.

7287218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643611.

The product of its digits is 12544, while the sum is 35.

The square root of 7287218 is about 2699.4847656544. The cubic root of 7287218 is about 193.8744537905.

The spelling of 7287218 in words is "seven million, two hundred eighty-seven thousand, two hundred eighteen".