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28173240 = 2332578259
BaseRepresentation
bin110101101111…
…0001110111000
31222000100102100
41223132032320
524203020430
62443503400
7461316504
oct153361670
958010370
1028173240
11149a2a77
129527b60
135ab5674
143a55304
152717960
hex1ade3b8

28173240 has 48 divisors (see below), whose sum is σ = 91564200. Its totient is φ = 7512768.

The previous prime is 28173227. The next prime is 28173241. The reversal of 28173240 is 4237182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38770 + ... + 39489.

Almost surely, 228173240 is an apocalyptic number.

28173240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28173240 is an abundant number, since it is smaller than the sum of its proper divisors (63390960).

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

28173240 is a wasteful number, since it uses less digits than its factorization.

28173240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78276 (or 78269 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28173240 is about 5307.8470211565. The cubic root of 28173240 is about 304.2838703471.

The spelling of 28173240 in words is "twenty-eight million, one hundred seventy-three thousand, two hundred forty".

Divisors: 1 2 3 4 5 6 8 9 10 12 15 18 20 24 30 36 40 45 60 72 90 120 180 360 78259 156518 234777 313036 391295 469554 626072 704331 782590 939108 1173885 1408662 1565180 1878216 2347770 2817324 3130360 3521655 4695540 5634648 7043310 9391080 14086620 28173240