645464170 has 32 divisors (see below), whose sum is σ = 1252847232. Its totient is φ = 238012992.

The previous prime is 645464159. The next prime is 645464179. The reversal of 645464170 is 71464546.

It is not an unprimeable number, because it can be changed into a prime (645464179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111979 + ... + 117601.

It is an arithmetic number, because the mean of its divisors is an integer number (39151476).

Almost surely, 2^645464170 is an apocalyptic number.

645464170 is a deficient number, since it is larger than the sum of its proper divisors (607383062).

645464170 is a wasteful number, since it uses less digits than its factorization.

645464170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6526.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 645464170 is about 25405.9868928566. The cubic root of 645464170 is about 864.2194703164.

The spelling of 645464170 in words is "six hundred forty-five million, four hundred sixty-four thousand, one hundred seventy".