645450174 has 16 divisors (see below), whose sum is σ = 1434333840. Its totient is φ = 215150040.

The previous prime is 645450139. The next prime is 645450227. The reversal of 645450174 is 471054546.

645450174 is a `hidden beast` number, since 645 + 4 + 5 + 0 + 1 + 7 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5976337 + ... + 5976444.

It is an arithmetic number, because the mean of its divisors is an integer number (89645865).

Almost surely, 2^645450174 is an apocalyptic number.

645450174 is an abundant number, since it is smaller than the sum of its proper divisors (788883666).

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

645450174 is a wasteful number, since it uses less digits than its factorization.

645450174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11952792 (or 11952786 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The square root of 645450174 is about 25405.7114444764. The cubic root of 645450174 is about 864.2132238023.

The spelling of 645450174 in words is "six hundred forty-five million, four hundred fifty thousand, one hundred seventy-four".