128766243 has 4 divisors (see below), whose sum is σ = 171688328. Its totient is φ = 85844160.

The previous prime is 128766241. The next prime is 128766257. The reversal of 128766243 is 342667821.

It is a happy number.

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

It is not a de Polignac number, because 128766243 - 2¹ = 128766241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128766241) 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, 21461038 + ... + 21461043.

It is an arithmetic number, because the mean of its divisors is an integer number (42922082).

Almost surely, 2^128766243 is an apocalyptic number.

128766243 is a deficient number, since it is larger than the sum of its proper divisors (42922085).

128766243 is an equidigital number, since it uses as much as digits as its factorization.

128766243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42922084.

The product of its digits is 96768, while the sum is 39.

The square root of 128766243 is about 11347.5214474351. The cubic root of 128766243 is about 504.9720508664.

The spelling of 128766243 in words is "one hundred twenty-eight million, seven hundred sixty-six thousand, two hundred forty-three".