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12428280 = 23325192379
BaseRepresentation
bin101111011010…
…001111111000
3212101102101200
4233122033320
511140201110
61122214200
7210432024
oct57321770
925342350
1012428280
117019607
1241b4360
132761c17
141917384
1511576c0
hexbda3f8

12428280 has 192 divisors, whose sum is σ = 44928000. Its totient is φ = 2965248.

The previous prime is 12428279. The next prime is 12428287. The reversal of 12428280 is 8282421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12428287) 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, 157281 + ... + 157359.

It is an arithmetic number, because the mean of its divisors is an integer number (234000).

Almost surely, 212428280 is an apocalyptic number.

12428280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12428280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22464000).

12428280 is an abundant number, since it is smaller than the sum of its proper divisors (32499720).

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

12428280 is a wasteful number, since it uses less digits than its factorization.

12428280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 12428280 is about 3525.3765756299. The cubic root of 12428280 is about 231.6347303997.

The spelling of 12428280 in words is "twelve million, four hundred twenty-eight thousand, two hundred eighty".