7318728 has 64 divisors (see below), whose sum is σ = 21004800. Its totient is φ = 2358720.

The previous prime is 7318723. The next prime is 7318733. The reversal of 7318728 is 8278137.

It is an interprime number because it is at equal distance from previous prime (7318723) and next prime (7318733).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7318692 and 7318701.

It is not an unprimeable number, because it can be changed into a prime (7318723) 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 in 15 ways as a sum of consecutive naturals, for example, 6150 + ... + 7242.

It is an arithmetic number, because the mean of its divisors is an integer number (328200).

Almost surely, 2^7318728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7318728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10502400).

7318728 is an abundant number, since it is smaller than the sum of its proper divisors (13686072).

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

7318728 is a wasteful number, since it uses less digits than its factorization.

7318728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1129 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 7318728 is about 2705.3147691165. The cubic root of 7318728 is about 194.1534903185.

The spelling of 7318728 in words is "seven million, three hundred eighteen thousand, seven hundred twenty-eight".