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636868 = 221131409
BaseRepresentation
bin10011011011111000100
31012100121201
42123133010
5130334433
621352244
75261521
oct2333704
91170551
10636868
113a5541
12268684
13193b5b
14128148
15c8a7d
hex9b7c4

636868 has 12 divisors (see below), whose sum is σ = 1125180. Its totient is φ = 315392.

The previous prime is 636863. The next prime is 636877. The reversal of 636868 is 868636.

It can be written as a sum of positive squares in 2 ways, for example, as 9604 + 627264 = 98^2 + 792^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636863) by changing a digit.

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, 253 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (93765).

2636868 is an apocalyptic number.

It is an amenable number.

636868 is a deficient number, since it is larger than the sum of its proper divisors (488312).

636868 is a wasteful number, since it uses less digits than its factorization.

636868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526 (or 1524 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 636868 is about 798.0400992431. The cubic root of 636868 is about 86.0365807962.

The spelling of 636868 in words is "six hundred thirty-six thousand, eight hundred sixty-eight".

Divisors: 1 2 4 113 226 452 1409 2818 5636 159217 318434 636868