6216645 has 16 divisors (see below), whose sum is σ = 10532160. Its totient is φ = 3120384.

The previous prime is 6216599. The next prime is 6216697. The reversal of 6216645 is 5466126.

6216645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6216645 - 2⁸ = 6216389 is a prime.

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, 11935 + ... + 12444.

It is an arithmetic number, because the mean of its divisors is an integer number (658260).

Almost surely, 2^6216645 is an apocalyptic number.

It is an amenable number.

6216645 is a deficient number, since it is larger than the sum of its proper divisors (4315515).

6216645 is a wasteful number, since it uses less digits than its factorization.

6216645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24404.

The product of its digits is 8640, while the sum is 30.

The square root of 6216645 is about 2493.3200757223. The cubic root of 6216645 is about 183.8733079508.

The spelling of 6216645 in words is "six million, two hundred sixteen thousand, six hundred forty-five".