7218888 has 16 divisors (see below), whose sum is σ = 18047280. Its totient is φ = 2406288.

The previous prime is 7218859. The next prime is 7218889. The reversal of 7218888 is 8888127.

It is a happy number.

It is a super-2 number, since 2×7218888² = 104224687913088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7218889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150370 + ... + 150417.

It is an arithmetic number, because the mean of its divisors is an integer number (1127955).

Almost surely, 2^7218888 is an apocalyptic number.

It is an amenable number.

7218888 is an abundant number, since it is smaller than the sum of its proper divisors (10828392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7218888 is a wasteful number, since it uses less digits than its factorization.

7218888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300796 (or 300792 counting only the distinct ones).

The product of its digits is 57344, while the sum is 42.

The square root of 7218888 is about 2686.7988387671. The cubic root of 7218888 is about 193.2665828488.

The spelling of 7218888 in words is "seven million, two hundred eighteen thousand, eight hundred eighty-eight".