645535808 has 28 divisors (see below), whose sum is σ = 1282458192. Its totient is φ = 322396800.

The previous prime is 645535771. The next prime is 645535817. The reversal of 645535808 is 808535546.

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 3 ways as a sum of consecutive naturals, for example, 55283 + ... + 65933.

Almost surely, 2^645535808 is an apocalyptic number.

It is an amenable number.

645535808 is a deficient number, since it is larger than the sum of its proper divisors (636922384).

645535808 is a wasteful number, since it uses less digits than its factorization.

645535808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11610 (or 11600 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 44.

The square root of 645535808 is about 25407.3967182787. The cubic root of 645535808 is about 864.2514414503.

The spelling of 645535808 in words is "six hundred forty-five million, five hundred thirty-five thousand, eight hundred eight".