645932608 has 28 divisors (see below), whose sum is σ = 1284185392. Its totient is φ = 322358400.

The previous prime is 645932537. The next prime is 645932659. The reversal of 645932608 is 806239546.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25783 + ... + 44233.

It is an arithmetic number, because the mean of its divisors is an integer number (45863764).

Almost surely, 2^645932608 is an apocalyptic number.

It is an amenable number.

645932608 is a deficient number, since it is larger than the sum of its proper divisors (638252784).

645932608 is a wasteful number, since it uses less digits than its factorization.

645932608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19010 (or 19000 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 645932608 is about 25415.2042683115. The cubic root of 645932608 is about 864.4284854532.

The spelling of 645932608 in words is "six hundred forty-five million, nine hundred thirty-two thousand, six hundred eight".