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645808 = 24181223
BaseRepresentation
bin10011101101010110000
31012210212211
42131222300
5131131213
621501504
75326552
oct2355260
91183784
10645808
11401229
12271894
13197c47
1412b4d2
15cb53d
hex9dab0

645808 has 20 divisors (see below), whose sum is σ = 1263808. Its totient is φ = 319680.

The previous prime is 645803. The next prime is 645833. The reversal of 645808 is 808546.

645808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645808.

It is not an unprimeable number, because it can be changed into a prime (645803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2785 + ... + 3007.

2645808 is an apocalyptic number.

It is an amenable number.

645808 is a deficient number, since it is larger than the sum of its proper divisors (618000).

645808 is a wasteful number, since it uses less digits than its factorization.

645808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 645808 is about 803.6218015958. The cubic root of 645808 is about 86.4372895737.

The spelling of 645808 in words is "six hundred forty-five thousand, eight hundred eight".