128670829 has 4 divisors (see below), whose sum is σ = 147052384. Its totient is φ = 110289276.

The previous prime is 128670823. The next prime is 128670847. The reversal of 128670829 is 928076821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128670829 - 2⁷ = 128670701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128670823) 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 3 ways as a sum of consecutive naturals, for example, 9190767 + ... + 9190780.

It is an arithmetic number, because the mean of its divisors is an integer number (36763096).

Almost surely, 2^128670829 is an apocalyptic number.

It is an amenable number.

128670829 is a deficient number, since it is larger than the sum of its proper divisors (18381555).

128670829 is an equidigital number, since it uses as much as digits as its factorization.

128670829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18381554.

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

The square root of 128670829 is about 11343.3164903391. The cubic root of 128670829 is about 504.8472942852.

The spelling of 128670829 in words is "one hundred twenty-eight million, six hundred seventy thousand, eight hundred twenty-nine".