645929564 has 18 divisors (see below), whose sum is σ = 1314928440. Its totient is φ = 276826872.

The previous prime is 645929551. The next prime is 645929579. The reversal of 645929564 is 465929546.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1647584 + ... + 1647975.

It is an arithmetic number, because the mean of its divisors is an integer number (73051580).

Almost surely, 2^645929564 is an apocalyptic number.

It is an amenable number.

645929564 is an abundant number, since it is smaller than the sum of its proper divisors (668998876).

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

645929564 is a wasteful number, since it uses less digits than its factorization.

645929564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295577 (or 3295568 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 50.

The square root of 645929564 is about 25415.1443828281. The cubic root of 645929564 is about 864.4271275590.

The spelling of 645929564 in words is "six hundred forty-five million, nine hundred twenty-nine thousand, five hundred sixty-four".