645406170 has 32 divisors (see below), whose sum is σ = 1590841728. Its totient is φ = 167456448.

The previous prime is 645406147. The next prime is 645406187. The reversal of 645406170 is 71604546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289614 + ... + 291833.

It is an arithmetic number, because the mean of its divisors is an integer number (49713804).

Almost surely, 2^645406170 is an apocalyptic number.

645406170 is an abundant number, since it is smaller than the sum of its proper divisors (945435558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645406170 is a wasteful number, since it uses less digits than its factorization.

645406170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581494.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 645406170 is about 25404.8454039776. The cubic root of 645406170 is about 864.1935839166.

The spelling of 645406170 in words is "six hundred forty-five million, four hundred six thousand, one hundred seventy".