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28139958 = 23271179257
BaseRepresentation
bin110101101011…
…0000110110110
31221221122202200
41223112012312
524200434313
62443045330
7461120460
oct153260666
957848680
1028139958
111497aa70
129510846
135aa3482
143a47130
15270cb73
hex1ad61b6

28139958 has 96 divisors (see below), whose sum is σ = 77276160. Its totient is φ = 7188480.

The previous prime is 28139957. The next prime is 28139963. The reversal of 28139958 is 85993182.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28139957) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109366 + ... + 109622.

It is an arithmetic number, because the mean of its divisors is an integer number (804960).

Almost surely, 228139958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28139958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38638080).

28139958 is an abundant number, since it is smaller than the sum of its proper divisors (49136202).

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

28139958 is a wasteful number, since it uses less digits than its factorization.

28139958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 359 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 28139958 is about 5304.7109252060. The cubic root of 28139958 is about 304.1640028623.

The spelling of 28139958 in words is "twenty-eight million, one hundred thirty-nine thousand, nine hundred fifty-eight".

Divisors: 1 2 3 6 7 9 11 14 18 21 22 33 42 63 66 77 79 99 126 154 158 198 231 237 257 462 474 514 553 693 711 771 869 1106 1386 1422 1542 1659 1738 1799 2313 2607 2827 3318 3598 4626 4977 5214 5397 5654 6083 7821 8481 9954 10794 12166 15642 16191 16962 18249 19789 20303 25443 32382 36498 39578 40606 50886 54747 59367 60909 109494 118734 121818 142121 178101 182727 223333 284242 356202 365454 426363 446666 669999 852726 1279089 1339998 1563331 2009997 2558178 3126662 4019994 4689993 9379986 14069979 28139958