645376158 has 36 divisors (see below), whose sum is σ = 1626613560. Its totient is φ = 184392936.

The previous prime is 645376139. The next prime is 645376181. The reversal of 645376158 is 851673546.

645376158 is a `hidden beast` number, since 6 + 4 + 537 + 61 + 58 = 666.

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 17 ways as a sum of consecutive naturals, for example, 364978 + ... + 366741.

It is an arithmetic number, because the mean of its divisors is an integer number (45183710).

Almost surely, 2^645376158 is an apocalyptic number.

645376158 is an abundant number, since it is smaller than the sum of its proper divisors (981237402).

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

645376158 is a wasteful number, since it uses less digits than its factorization.

645376158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731741 (or 731731 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 645376158 is about 25404.2547223885. The cubic root of 645376158 is about 864.1801884348.

The spelling of 645376158 in words is "six hundred forty-five million, three hundred seventy-six thousand, one hundred fifty-eight".