128824887 has 4 divisors (see below), whose sum is σ = 171766520. Its totient is φ = 85883256.

The previous prime is 128824877. The next prime is 128824889. The reversal of 128824887 is 788428821.

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

It is not a de Polignac number, because 128824887 - 2⁶ = 128824823 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 (128824889) 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, 21470812 + ... + 21470817.

It is an arithmetic number, because the mean of its divisors is an integer number (42941630).

Almost surely, 2^128824887 is an apocalyptic number.

128824887 is a deficient number, since it is larger than the sum of its proper divisors (42941633).

128824887 is an equidigital number, since it uses as much as digits as its factorization.

128824887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42941632.

The product of its digits is 458752, while the sum is 48.

The square root of 128824887 is about 11350.1051536979. The cubic root of 128824887 is about 505.0486990255.

The spelling of 128824887 in words is "one hundred twenty-eight million, eight hundred twenty-four thousand, eight hundred eighty-seven".