645570312 has 16 divisors (see below), whose sum is σ = 1613925840. Its totient is φ = 215190096.

The previous prime is 645570307. The next prime is 645570313. The reversal of 645570312 is 213075546.

645570312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645570312² = 833522055471554688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645570313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13449358 + ... + 13449405.

It is an arithmetic number, because the mean of its divisors is an integer number (100870365).

Almost surely, 2^645570312 is an apocalyptic number.

It is an amenable number.

645570312 is an abundant number, since it is smaller than the sum of its proper divisors (968355528).

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

645570312 is a wasteful number, since it uses less digits than its factorization.

645570312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26898772 (or 26898768 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 645570312 is about 25408.0757240685. The cubic root of 645570312 is about 864.2668393054.

It can be divided in two parts, 6455 and 70312, that added together give a palindrome (76767).

The spelling of 645570312 in words is "six hundred forty-five million, five hundred seventy thousand, three hundred twelve".