128588813 has 4 divisors (see below), whose sum is σ = 133022940. Its totient is φ = 124154688.

The previous prime is 128588797. The next prime is 128588819. The reversal of 128588813 is 318885821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318885821 = 2689 ⋅118589.

It can be written as a sum of positive squares in 2 ways, for example, as 81775849 + 46812964 = 9043^2 + 6842^2 .

It is a cyclic number.

It is not a de Polignac number, because 128588813 - 2⁴ = 128588797 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 (128588819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2217020 + ... + 2217077.

It is an arithmetic number, because the mean of its divisors is an integer number (33255735).

Almost surely, 2^128588813 is an apocalyptic number.

It is an amenable number.

128588813 is a deficient number, since it is larger than the sum of its proper divisors (4434127).

128588813 is an equidigital number, since it uses as much as digits as its factorization.

128588813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4434126.

The product of its digits is 122880, while the sum is 44.

The square root of 128588813 is about 11339.7007456105. The cubic root of 128588813 is about 504.7400066776.

The spelling of 128588813 in words is "one hundred twenty-eight million, five hundred eighty-eight thousand, eight hundred thirteen".