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253665128 = 23278911369
BaseRepresentation
bin11110001111010…
…01111101101000
3122200022112010202
433013221331220
51004414241003
641100531332
76200055323
oct1707517550
9580275122
10253665128
11120207402
1270b50b48
1340726a12
14259917ba
151740a088
hexf1e9f68

253665128 has 16 divisors (see below), whose sum is σ = 475834500. Its totient is φ = 126775936.

The previous prime is 253665121. The next prime is 253665187. The reversal of 253665128 is 821566352.

It can be written as a sum of positive squares in 2 ways, for example, as 250968964 + 2696164 = 15842^2 + 1642^2 .

It is a junction number, because it is equal to n+sod(n) for n = 253665091 and 253665100.

It is not an unprimeable number, because it can be changed into a prime (253665121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16628 + ... + 27996.

Almost surely, 2253665128 is an apocalyptic number.

It is an amenable number.

253665128 is a deficient number, since it is larger than the sum of its proper divisors (222169372).

253665128 is a wasteful number, since it uses less digits than its factorization.

253665128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14164 (or 14160 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The square root of 253665128 is about 15926.8681164879. The cubic root of 253665128 is about 633.0241167052.

The spelling of 253665128 in words is "two hundred fifty-three million, six hundred sixty-five thousand, one hundred twenty-eight".

Divisors: 1 2 4 8 2789 5578 11156 11369 22312 22738 45476 90952 31708141 63416282 126832564 253665128