645224236 has 36 divisors (see below), whose sum is σ = 1160031600. Its totient is φ = 314002720.

The previous prime is 645224227. The next prime is 645224263. The reversal of 645224236 is 632422546.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2074521 + ... + 2074831.

It is an arithmetic number, because the mean of its divisors is an integer number (32223100).

Almost surely, 2^645224236 is an apocalyptic number.

It is an amenable number.

645224236 is a deficient number, since it is larger than the sum of its proper divisors (514807364).

645224236 is a wasteful number, since it uses less digits than its factorization.

645224236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 521 counting only the distinct ones).

The product of its digits is 69120, while the sum is 34.

The square root of 645224236 is about 25401.2644567155. The cubic root of 645224236 is about 864.1123735726.

The spelling of 645224236 in words is "six hundred forty-five million, two hundred twenty-four thousand, two hundred thirty-six".