128829711 has 4 divisors (see below), whose sum is σ = 171772952. Its totient is φ = 85886472.

The previous prime is 128829703. The next prime is 128829733. The reversal of 128829711 is 117928821.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 128829711 - 2³ = 128829703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128829711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128821711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21471616 + ... + 21471621.

It is an arithmetic number, because the mean of its divisors is an integer number (42943238).

Almost surely, 2^128829711 is an apocalyptic number.

128829711 is a deficient number, since it is larger than the sum of its proper divisors (42943241).

128829711 is an equidigital number, since it uses as much as digits as its factorization.

128829711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42943240.

The product of its digits is 16128, while the sum is 39.

The square root of 128829711 is about 11350.3176607529. The cubic root of 128829711 is about 505.0550029951.

The spelling of 128829711 in words is "one hundred twenty-eight million, eight hundred twenty-nine thousand, seven hundred eleven".