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51689412 = 22328317299
BaseRepresentation
bin1100010100101…
…1011111000100
310121021002112200
43011023133010
5101213030122
65043514500
71165231665
oct305133704
9117232480
1051689412
11271a5025
1215388a30
13a92a368
146c1736c
1548105ac
hex314b7c4

51689412 has 36 divisors (see below), whose sum is σ = 132241200. Its totient is φ = 17021232.

The previous prime is 51689389. The next prime is 51689413. The reversal of 51689412 is 21498615.

51689412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51689413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5662 + ... + 11637.

Almost surely, 251689412 is an apocalyptic number.

It is an amenable number.

51689412 is an abundant number, since it is smaller than the sum of its proper divisors (80551788).

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

51689412 is a wasteful number, since it uses less digits than its factorization.

51689412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17392 (or 17387 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 51689412 is about 7189.5348945533. The cubic root of 51689412 is about 372.5065074010.

The spelling of 51689412 in words is "fifty-one million, six hundred eighty-nine thousand, four hundred twelve".

Divisors: 1 2 3 4 6 9 12 18 36 83 166 249 332 498 747 996 1494 2988 17299 34598 51897 69196 103794 155691 207588 311382 622764 1435817 2871634 4307451 5743268 8614902 12922353 17229804 25844706 51689412