3216645 has 16 divisors (see below), whose sum is σ = 5718720. Its totient is φ = 1715472.

The previous prime is 3216637. The next prime is 3216649. The reversal of 3216645 is 5466123.

3216645 is a `hidden beast` number, since 3 + 2 + 16 + 645 = 666.

It is not a de Polignac number, because 3216645 - 2³ = 3216637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

3216645 is a lucky number.

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 15 ways as a sum of consecutive naturals, for example, 11779 + ... + 12048.

It is an arithmetic number, because the mean of its divisors is an integer number (357420).

Almost surely, 2^3216645 is an apocalyptic number.

It is an amenable number.

3216645 is a deficient number, since it is larger than the sum of its proper divisors (2502075).

3216645 is a wasteful number, since it uses less digits than its factorization.

3216645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23841 (or 23835 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 3216645 is about 1793.5007666572. The cubic root of 3216645 is about 147.6163211511.

The spelling of 3216645 in words is "three million, two hundred sixteen thousand, six hundred forty-five".