128866733 has 4 divisors (see below), whose sum is σ = 129342528. Its totient is φ = 128390940.

The previous prime is 128866693. The next prime is 128866747. The reversal of 128866733 is 337668821.

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 128866733 - 2²⁰ = 127818157 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 (128866763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237491 + ... + 238032.

It is an arithmetic number, because the mean of its divisors is an integer number (32335632).

Almost surely, 2^128866733 is an apocalyptic number.

It is an amenable number.

128866733 is a deficient number, since it is larger than the sum of its proper divisors (475795).

128866733 is an equidigital number, since it uses as much as digits as its factorization.

128866733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475794.

The product of its digits is 290304, while the sum is 44.

The square root of 128866733 is about 11351.9484230682. The cubic root of 128866733 is about 505.1033778494.

The spelling of 128866733 in words is "one hundred twenty-eight million, eight hundred sixty-six thousand, seven hundred thirty-three".