645307256 has 16 divisors (see below), whose sum is σ = 1319946840. Its totient is φ = 293321440.

The previous prime is 645307237. The next prime is 645307259. The reversal of 645307256 is 652703546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645307259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3666431 + ... + 3666606.

Almost surely, 2^645307256 is an apocalyptic number.

It is an amenable number.

645307256 is an abundant number, since it is smaller than the sum of its proper divisors (674639584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645307256 is a wasteful number, since it uses less digits than its factorization.

645307256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7333054 (or 7333050 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 645307256 is about 25402.8985747690. The cubic root of 645307256 is about 864.1494333153.

The spelling of 645307256 in words is "six hundred forty-five million, three hundred seven thousand, two hundred fifty-six".