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129845856 = 25372331271
BaseRepresentation
bin1111011110101…
…00101001100000
3100001022212000210
413233110221200
5231220031411
620515014120
73134446230
oct757245140
9301285023
10129845856
1167327128
123759a340
1320b9358a
141335dcc0
15b5ecca6
hex7bd4a60

129845856 has 192 divisors, whose sum is σ = 421134336. Its totient is φ = 34214400.

The previous prime is 129845851. The next prime is 129845857. The reversal of 129845856 is 658548921.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129845851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 479001 + ... + 479271.

It is an arithmetic number, because the mean of its divisors is an integer number (2193408).

Almost surely, 2129845856 is an apocalyptic number.

129845856 is a gapful number since it is divisible by the number (16) 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 129845856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210567168).

129845856 is an abundant number, since it is smaller than the sum of its proper divisors (291288480).

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

129845856 is a wasteful number, since it uses less digits than its factorization.

129845856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 337 counting only the distinct ones).

The product of its digits is 691200, while the sum is 48.

The square root of 129845856 is about 11394.9925844645. The cubic root of 129845856 is about 506.3794016414.

The spelling of 129845856 in words is "one hundred twenty-nine million, eight hundred forty-five thousand, eight hundred fifty-six".