645385675 has 12 divisors (see below), whose sum is σ = 873031176. Its totient is φ = 469371200.

The previous prime is 645385651. The next prime is 645385693. The reversal of 645385675 is 576583546.

It is not a de Polignac number, because 645385675 - 2⁹ = 645385163 is a prime.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 1173154 + ... + 1173703.

It is an arithmetic number, because the mean of its divisors is an integer number (72752598).

Almost surely, 2^645385675 is an apocalyptic number.

645385675 is a deficient number, since it is larger than the sum of its proper divisors (227645501).

645385675 is a wasteful number, since it uses less digits than its factorization.

645385675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346878 (or 2346873 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 49.

The square root of 645385675 is about 25404.4420328414. The cubic root of 645385675 is about 864.1844362740.

The spelling of 645385675 in words is "six hundred forty-five million, three hundred eighty-five thousand, six hundred seventy-five".