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128247882887 = 1719397052269
BaseRepresentation
bin111011101110000101…
…0110110010010000111
3110021000211000110210102
41313130022312102013
54100122424223022
6134525525114315
712160050006125
oct1673412662207
9407024013712
10128247882887
114a43164a663
1220a31b5899b
13c12abab347
1462c88d8915
153509117a92
hex1ddc2b6487

128247882887 has 8 divisors (see below), whose sum is σ = 142938817200. Its totient is φ = 114351053184.

The previous prime is 128247882857. The next prime is 128247882923. The reversal of 128247882887 is 788288742821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128247882887 - 210 = 128247881863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128247882857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198525812 + ... + 198526457.

It is an arithmetic number, because the mean of its divisors is an integer number (17867352150).

Almost surely, 2128247882887 is an apocalyptic number.

128247882887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

128247882887 is a deficient number, since it is larger than the sum of its proper divisors (14690934313).

128247882887 is a wasteful number, since it uses less digits than its factorization.

128247882887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397052305.

The product of its digits is 51380224, while the sum is 65.

The spelling of 128247882887 in words is "one hundred twenty-eight billion, two hundred forty-seven million, eight hundred eighty-two thousand, eight hundred eighty-seven".

Divisors: 1 17 19 323 397052269 6749888573 7543993111 128247882887