3216720 has 80 divisors (see below), whose sum is σ = 10749312. Its totient is φ = 791040.

The previous prime is 3216691. The next prime is 3216751. The reversal of 3216720 is 276123.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2605 + ... + 3635.

Almost surely, 2^3216720 is an apocalyptic number.

3216720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3216720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5374656).

3216720 is an abundant number, since it is smaller than the sum of its proper divisors (7532592).

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

3216720 is a wasteful number, since it uses less digits than its factorization.

3216720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 3216720 is about 1793.5216753639. The cubic root of 3216720 is about 147.6174684270.

The spelling of 3216720 in words is "three million, two hundred sixteen thousand, seven hundred twenty".