645248216 has 16 divisors (see below), whose sum is σ = 1212804600. Its totient is φ = 321833664.

The previous prime is 645248203. The next prime is 645248251. The reversal of 645248216 is 612842546.

It is a self number, because there is not a number n which added to its sum of digits gives 645248216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95330 + ... + 101873.

Almost surely, 2^645248216 is an apocalyptic number.

It is an amenable number.

645248216 is a deficient number, since it is larger than the sum of its proper divisors (567556384).

645248216 is a wasteful number, since it uses less digits than its factorization.

645248216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197618 (or 197614 counting only the distinct ones).

The product of its digits is 92160, while the sum is 38.

The square root of 645248216 is about 25401.7364760758. The cubic root of 645248216 is about 864.1230784598.

The spelling of 645248216 in words is "six hundred forty-five million, two hundred forty-eight thousand, two hundred sixteen".