645204312 has 32 divisors (see below), whose sum is σ = 1792234800. Its totient is φ = 215068032.

The previous prime is 645204311. The next prime is 645204341. The reversal of 645204312 is 213402546.

645204312 is a `hidden beast` number, since 645 + 2 + 0 + 4 + 3 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645204311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1493313 + ... + 1493744.

Almost surely, 2^645204312 is an apocalyptic number.

It is an amenable number.

645204312 is an abundant number, since it is smaller than the sum of its proper divisors (1147030488).

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

645204312 is a wasteful number, since it uses less digits than its factorization.

645204312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2987072 (or 2987062 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 645204312 is about 25400.8722684872. The cubic root of 645204312 is about 864.1034791184.

Adding to 645204312 its reverse (213402546), we get a palindrome (858606858).

The spelling of 645204312 in words is "six hundred forty-five million, two hundred four thousand, three hundred twelve".