7218736 has 20 divisors (see below), whose sum is σ = 15984592. Its totient is φ = 3093696.

The previous prime is 7218721. The next prime is 7218749. The reversal of 7218736 is 6378127.

It is a super-2 number, since 2×7218736² = 104220298875392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32115 + ... + 32338.

Almost surely, 2^7218736 is an apocalyptic number.

It is an amenable number.

7218736 is an abundant number, since it is smaller than the sum of its proper divisors (8765856).

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

7218736 is a wasteful number, since it uses less digits than its factorization.

7218736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64468 (or 64462 counting only the distinct ones).

The product of its digits is 14112, while the sum is 34.

The square root of 7218736 is about 2686.7705521685. The cubic root of 7218736 is about 193.2652263736.

The spelling of 7218736 in words is "seven million, two hundred eighteen thousand, seven hundred thirty-six".