128766633 has 4 divisors (see below), whose sum is σ = 171688848. Its totient is φ = 85844420.

The previous prime is 128766611. The next prime is 128766647. The reversal of 128766633 is 336667821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128766633 - 2⁵ = 128766601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128766683) 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, 21461103 + ... + 21461108.

It is an arithmetic number, because the mean of its divisors is an integer number (42922212).

Almost surely, 2^128766633 is an apocalyptic number.

It is an amenable number.

128766633 is a deficient number, since it is larger than the sum of its proper divisors (42922215).

128766633 is an equidigital number, since it uses as much as digits as its factorization.

128766633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42922214.

The product of its digits is 217728, while the sum is 42.

The square root of 128766633 is about 11347.5386317915. The cubic root of 128766633 is about 504.9725606762.

The spelling of 128766633 in words is "one hundred twenty-eight million, seven hundred sixty-six thousand, six hundred thirty-three".