128388813 has 8 divisors (see below), whose sum is σ = 195640128. Its totient is φ = 73365024.

The previous prime is 128388809. The next prime is 128388839. The reversal of 128388813 is 318883821.

It is a happy number.

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

It is not a de Polignac number, because 128388813 - 2² = 128388809 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128388413) 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, 3056856 + ... + 3056897.

It is an arithmetic number, because the mean of its divisors is an integer number (24455016).

Almost surely, 2^128388813 is an apocalyptic number.

It is an amenable number.

128388813 is a deficient number, since it is larger than the sum of its proper divisors (67251315).

128388813 is an equidigital number, since it uses as much as digits as its factorization.

128388813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113763.

The product of its digits is 73728, while the sum is 42.

The square root of 128388813 is about 11330.8787390917. The cubic root of 128388813 is about 504.4781892338.

The spelling of 128388813 in words is "one hundred twenty-eight million, three hundred eighty-eight thousand, eight hundred thirteen".