645463375 has 32 divisors (see below), whose sum is σ = 844286976. Its totient is φ = 491735200.

The previous prime is 645463367. The next prime is 645463391. The reversal of 645463375 is 573364546.

It is not a de Polignac number, because 645463375 - 2³ = 645463367 is a prime.

It is a Duffinian number.

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 31 ways as a sum of consecutive naturals, for example, 997302 + ... + 997948.

It is an arithmetic number, because the mean of its divisors is an integer number (26383968).

Almost surely, 2^645463375 is an apocalyptic number.

645463375 is a deficient number, since it is larger than the sum of its proper divisors (198823601).

645463375 is a wasteful number, since it uses less digits than its factorization.

645463375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1022 counting only the distinct ones).

The product of its digits is 907200, while the sum is 43.

The square root of 645463375 is about 25405.9712469333. The cubic root of 645463375 is about 864.2191155047.

The spelling of 645463375 in words is "six hundred forty-five million, four hundred sixty-three thousand, three hundred seventy-five".