128782069 has 8 divisors (see below), whose sum is σ = 143471160. Its totient is φ = 114776256.

The previous prime is 128782067. The next prime is 128782079. The reversal of 128782069 is 960287821.

It can be written as a sum of positive squares in 4 ways, for example, as 5349969 + 123432100 = 2313^2 + 11110^2 .

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 128782069 - 2¹ = 128782067 is a prime.

It is a super-2 number, since 2×128782069² = 33169642591841522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128782063) 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 7 ways as a sum of consecutive naturals, for example, 170422 + ... + 171175.

It is an arithmetic number, because the mean of its divisors is an integer number (17933895).

Almost surely, 2^128782069 is an apocalyptic number.

It is an amenable number.

128782069 is a deficient number, since it is larger than the sum of its proper divisors (14689091).

128782069 is a wasteful number, since it uses less digits than its factorization.

128782069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341639.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 128782069 is about 11348.2187589066. The cubic root of 128782069 is about 504.9927378624.

The spelling of 128782069 in words is "one hundred twenty-eight million, seven hundred eighty-two thousand, sixty-nine".