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53665644 = 2234472137
BaseRepresentation
bin1100110010110…
…1111101101100
310201222111102110
43030231331230
5102214300034
65154124020
71221102414
oct314557554
9121874373
1053665644
112832487a
1215b80610
13b16ca26
1471ad644
154aa0de9
hex332df6c

53665644 has 12 divisors (see below), whose sum is σ = 125219864. Its totient is φ = 17888544.

The previous prime is 53665637. The next prime is 53665649. The reversal of 53665644 is 44656635.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (53665649) 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, 2236057 + ... + 2236080.

Almost surely, 253665644 is an apocalyptic number.

It is an amenable number.

53665644 is an abundant number, since it is smaller than the sum of its proper divisors (71554220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53665644 is a wasteful number, since it uses less digits than its factorization.

53665644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472144 (or 4472142 counting only the distinct ones).

The product of its digits is 259200, while the sum is 39.

The square root of 53665644 is about 7325.6838588626. The cubic root of 53665644 is about 377.1945841913.

Subtracting from 53665644 its reverse (44656635), we obtain a palindrome (9009009).

The spelling of 53665644 in words is "fifty-three million, six hundred sixty-five thousand, six hundred forty-four".

Divisors: 1 2 3 4 6 12 4472137 8944274 13416411 17888548 26832822 53665644