128787211 has 8 divisors (see below), whose sum is σ = 147381984. Its totient is φ = 110241600.

The previous prime is 128787203. The next prime is 128787229. The reversal of 128787211 is 112787821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128787211 - 2³ = 128787203 is a prime.

It is a super-2 number, since 2×128787211² = 33172291434317042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128787251) 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, 6490 + ... + 17311.

It is an arithmetic number, because the mean of its divisors is an integer number (18422748).

Almost surely, 2^128787211 is an apocalyptic number.

128787211 is a deficient number, since it is larger than the sum of its proper divisors (18594773).

128787211 is an equidigital number, since it uses as much as digits as its factorization.

128787211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24581.

The product of its digits is 12544, while the sum is 37.

The square root of 128787211 is about 11348.4453120240. The cubic root of 128787211 is about 504.9994588760. Note that the first 3 decimals are identical.

The spelling of 128787211 in words is "one hundred twenty-eight million, seven hundred eighty-seven thousand, two hundred eleven".