128787011 has 4 divisors (see below), whose sum is σ = 128866392. Its totient is φ = 128707632.

The previous prime is 128787007. The next prime is 128787013. The reversal of 128787011 is 110787821.

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

It is a cyclic number.

It is not a de Polignac number, because 128787011 - 2² = 128787007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128787013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37205 + ... + 40518.

It is an arithmetic number, because the mean of its divisors is an integer number (32216598).

Almost surely, 2^128787011 is an apocalyptic number.

128787011 is a deficient number, since it is larger than the sum of its proper divisors (79381).

128787011 is an equidigital number, since it uses as much as digits as its factorization.

128787011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79380.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 128787011 is about 11348.4365002409. The cubic root of 128787011 is about 504.9991974630. Note that the first 3 decimals are identical.

The spelling of 128787011 in words is "one hundred twenty-eight million, seven hundred eighty-seven thousand, eleven".