7216640 has 40 divisors (see below), whose sum is σ = 17309160. Its totient is φ = 2885632.

The previous prime is 7216633. The next prime is 7216661. The reversal of 7216640 is 466127.

It is a tau number, because it is divible by the number of its divisors (40).

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, 1151 + ... + 3969.

It is an arithmetic number, because the mean of its divisors is an integer number (432729).

Almost surely, 2^7216640 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 7216640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8654580).

7216640 is an abundant number, since it is smaller than the sum of its proper divisors (10092520).

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

7216640 is an equidigital number, since it uses as much as digits as its factorization.

7216640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842 (or 2826 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 7216640 is about 2686.3804644912. The cubic root of 7216640 is about 193.2465193531.

The spelling of 7216640 in words is "seven million, two hundred sixteen thousand, six hundred forty".