645776222 has 16 divisors (see below), whose sum is σ = 1192202592. Its totient is φ = 255471840.

The previous prime is 645776203. The next prime is 645776269. The reversal of 645776222 is 222677546.

It is a self number, because there is not a number n which added to its sum of digits gives 645776222.

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, 1773929 + ... + 1774292.

It is an arithmetic number, because the mean of its divisors is an integer number (74512662).

Almost surely, 2^645776222 is an apocalyptic number.

645776222 is a deficient number, since it is larger than the sum of its proper divisors (546426370).

645776222 is a wasteful number, since it uses less digits than its factorization.

645776222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548243.

The product of its digits is 282240, while the sum is 41.

The square root of 645776222 is about 25412.1274591483. The cubic root of 645776222 is about 864.3587178940.

The spelling of 645776222 in words is "six hundred forty-five million, seven hundred seventy-six thousand, two hundred twenty-two".