128280471 has 16 divisors (see below), whose sum is σ = 186831360. Its totient is φ = 77645120.

The previous prime is 128280421. The next prime is 128280473. The reversal of 128280471 is 174082821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128280471 - 2¹⁵ = 128247703 is a prime.

It is a super-3 number, since 3×128280471³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128280473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29410 + ... + 33488.

It is an arithmetic number, because the mean of its divisors is an integer number (11676960).

Almost surely, 2^128280471 is an apocalyptic number.

128280471 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128280471 is a deficient number, since it is larger than the sum of its proper divisors (58550889).

128280471 is a wasteful number, since it uses less digits than its factorization.

128280471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 128280471 is about 11326.0969005214. The cubic root of 128280471 is about 504.3362465522.

The spelling of 128280471 in words is "one hundred twenty-eight million, two hundred eighty thousand, four hundred seventy-one".