128829789 has 36 divisors (see below), whose sum is σ = 205757916. Its totient is φ = 77616000.

The previous prime is 128829737. The next prime is 128829793. The reversal of 128829789 is 987928821.

It can be written as a sum of positive squares in 2 ways, for example, as 31472100 + 97357689 = 5610^2 + 9867^2 .

It is not a de Polignac number, because 128829789 - 2⁹ = 128829277 is a prime.

It is a super-2 number, since 2×128829789² = 33194229067569042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128829989) 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 35 ways as a sum of consecutive naturals, for example, 305799 + ... + 306219.

Almost surely, 2^128829789 is an apocalyptic number.

It is an amenable number.

128829789 is a deficient number, since it is larger than the sum of its proper divisors (76928127).

128829789 is a wasteful number, since it uses less digits than its factorization.

128829789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 716 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 128829789 is about 11350.3210967796. The cubic root of 128829789 is about 505.0551049236.

The spelling of 128829789 in words is "one hundred twenty-eight million, eight hundred twenty-nine thousand, seven hundred eighty-nine".