128820873 has 8 divisors (see below), whose sum is σ = 171963648. Its totient is φ = 85779344.

The previous prime is 128820869. The next prime is 128820877. The reversal of 128820873 is 378028821.

It is an interprime number because it is at equal distance from previous prime (128820869) and next prime (128820877).

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 128820873 - 2² = 128820869 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128820877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22290 + ... + 27467.

It is an arithmetic number, because the mean of its divisors is an integer number (21495456).

Almost surely, 2^128820873 is an apocalyptic number.

It is an amenable number.

128820873 is a deficient number, since it is larger than the sum of its proper divisors (43142775).

128820873 is an equidigital number, since it uses as much as digits as its factorization.

128820873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50623.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 128820873 is about 11349.9283257649. The cubic root of 128820873 is about 505.0434534383.

The spelling of 128820873 in words is "one hundred twenty-eight million, eight hundred twenty thousand, eight hundred seventy-three".