128782 has 8 divisors (see below), whose sum is σ = 203400. Its totient is φ = 60984.

The previous prime is 128767. The next prime is 128813. The reversal of 128782 is 287821.

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

It is a self number, because there is not a number n which added to its sum of digits gives 128782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1657 + ... + 1732.

It is an arithmetic number, because the mean of its divisors is an integer number (25425).

2¹²⁸⁷⁸² is an apocalyptic number.

128782 is a deficient number, since it is larger than the sum of its proper divisors (74618).

128782 is a wasteful number, since it uses less digits than its factorization.

128782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410.

The product of its digits is 1792, while the sum is 28.

The square root of 128782 is about 358.8620905027. The cubic root of 128782 is about 50.4992647673.

It can be divided in two parts, 12878 and 2, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 128782 in words is "one hundred twenty-eight thousand, seven hundred eighty-two".