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BaseRepresentation
bin111011101110000101…
…0110110010010000101
3110021000211000110210100
41313130022312102011
54100122424223020
6134525525114313
712160050006123
oct1673412662205
9407024013710
10128247882885
114a43164a661
1220a31b58999
13c12abab345
1462c88d8913
153509117a90
hex1ddc2b6485

128247882885 has 24 divisors (see below), whose sum is σ = 223006566744. Its totient is φ = 68180336640.

The previous prime is 128247882857. The next prime is 128247882923. The reversal of 128247882885 is 588288742821.

128247882885 is a `hidden beast` number, since 1 + 2 + 8 + 2 + 478 + 82 + 8 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13485480129 + 114762402756 = 116127^2 + 338766^2 .

It is not a de Polignac number, because 128247882885 - 212 = 128247878789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4538556 + ... + 4566725.

It is an arithmetic number, because the mean of its divisors is an integer number (9291940281).

Almost surely, 2128247882885 is an apocalyptic number.

128247882885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128247882885 is a deficient number, since it is larger than the sum of its proper divisors (94758683859).

128247882885 is a wasteful number, since it uses less digits than its factorization.

128247882885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9105605 (or 9105602 counting only the distinct ones).

The product of its digits is 36700160, while the sum is 63.

The spelling of 128247882885 in words is "one hundred twenty-eight billion, two hundred forty-seven million, eight hundred eighty-two thousand, eight hundred eighty-five".