645320182 has 16 divisors (see below), whose sum is σ = 1070615952. Its totient is φ = 289789920.

The previous prime is 645320141. The next prime is 645320191. The reversal of 645320182 is 281023546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334444 + ... + 336367.

It is an arithmetic number, because the mean of its divisors is an integer number (66913497).

Almost surely, 2^645320182 is an apocalyptic number.

645320182 is a deficient number, since it is larger than the sum of its proper divisors (425295770).

645320182 is a wasteful number, since it uses less digits than its factorization.

645320182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670863.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 645320182 is about 25403.1529932802. The cubic root of 645320182 is about 864.1552031358.

The spelling of 645320182 in words is "six hundred forty-five million, three hundred twenty thousand, one hundred eighty-two".