128678829 has 16 divisors (see below), whose sum is σ = 180405120. Its totient is φ = 81466560.

The previous prime is 128678819. The next prime is 128678839. The reversal of 128678829 is 928876821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128678819) and next prime (128678839).

It is not a de Polignac number, because 128678829 - 2⁷ = 128678701 is a prime.

It is a super-2 number, since 2×128678829² = 33116482065622482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128678819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6817 + ... + 17430.

It is an arithmetic number, because the mean of its divisors is an integer number (11275320).

Almost surely, 2^128678829 is an apocalyptic number.

It is an amenable number.

128678829 is a deficient number, since it is larger than the sum of its proper divisors (51726291).

128678829 is a wasteful number, since it uses less digits than its factorization.

128678829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24340.

The product of its digits is 774144, while the sum is 51.

The square root of 128678829 is about 11343.6691154141. The cubic root of 128678829 is about 504.8577568862.

The spelling of 128678829 in words is "one hundred twenty-eight million, six hundred seventy-eight thousand, eight hundred twenty-nine".