645814876 has 24 divisors (see below), whose sum is σ = 1310911616. Its totient is φ = 272646000.

The previous prime is 645814859. The next prime is 645814877. The reversal of 645814876 is 678418546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645814877) by changing a digit.

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, 170250 + ... + 174001.

Almost surely, 2^645814876 is an apocalyptic number.

It is an amenable number.

645814876 is an abundant number, since it is smaller than the sum of its proper divisors (665096740).

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

645814876 is a wasteful number, since it uses less digits than its factorization.

645814876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344329 (or 344327 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 49.

The square root of 645814876 is about 25412.8879901518. The cubic root of 645814876 is about 864.3759634218.

The spelling of 645814876 in words is "six hundred forty-five million, eight hundred fourteen thousand, eight hundred seventy-six".