3216640 has 72 divisors (see below), whose sum is σ = 8830080. Its totient is φ = 1099776.

The previous prime is 3216637. The next prime is 3216649. The reversal of 3216640 is 466123.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3216649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8781 + ... + 9139.

It is an arithmetic number, because the mean of its divisors is an integer number (122640).

Almost surely, 2^3216640 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 3216640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4415040).

3216640 is an abundant number, since it is smaller than the sum of its proper divisors (5613440).

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

3216640 is an equidigital number, since it uses as much as digits as its factorization.

3216640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 3216640 is about 1793.4993727348. The cubic root of 3216640 is about 147.6162446654.

The spelling of 3216640 in words is "three million, two hundred sixteen thousand, six hundred forty".