645212215 has 8 divisors (see below), whose sum is σ = 807918048. Its totient is φ = 493727520.

The previous prime is 645212201. The next prime is 645212221. The reversal of 645212215 is 512212546.

645212215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-645212215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2805156 + ... + 2805385.

It is an arithmetic number, because the mean of its divisors is an integer number (100989756).

Almost surely, 2^645212215 is an apocalyptic number.

645212215 is a deficient number, since it is larger than the sum of its proper divisors (162705833).

645212215 is a wasteful number, since it uses less digits than its factorization.

645212215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5610569.

The product of its digits is 4800, while the sum is 28.

The square root of 645212215 is about 25401.0278335346. The cubic root of 645212215 is about 864.1070071905.

The spelling of 645212215 in words is "six hundred forty-five million, two hundred twelve thousand, two hundred fifteen".