645305084 has 12 divisors (see below), whose sum is σ = 1145189808. Its totient is φ = 318108000.

The previous prime is 645305081. The next prime is 645305093. The reversal of 645305084 is 480503546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645305081) 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, 1135817 + ... + 1136384.

It is an arithmetic number, because the mean of its divisors is an integer number (95432484).

Almost surely, 2^645305084 is an apocalyptic number.

It is an amenable number.

645305084 is a deficient number, since it is larger than the sum of its proper divisors (499884724).

645305084 is a wasteful number, since it uses less digits than its factorization.

645305084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272276 (or 2272274 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 645305084 is about 25402.8558237061. The cubic root of 645305084 is about 864.1484637851.

The spelling of 645305084 in words is "six hundred forty-five million, three hundred five thousand, eighty-four".