128800993 has 4 divisors (see below), whose sum is σ = 136377540. Its totient is φ = 121224448.

The previous prime is 128800979. The next prime is 128800999. The reversal of 128800993 is 399008821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 119968209 + 8832784 = 10953^2 + 2972^2 .

It is a cyclic number.

It is not a de Polignac number, because 128800993 - 2¹⁷ = 128669921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128800999) 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, 3788248 + ... + 3788281.

It is an arithmetic number, because the mean of its divisors is an integer number (34094385).

Almost surely, 2^128800993 is an apocalyptic number.

It is an amenable number.

128800993 is a deficient number, since it is larger than the sum of its proper divisors (7576547).

128800993 is an equidigital number, since it uses as much as digits as its factorization.

128800993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7576546.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 128800993 is about 11349.0525155186. The cubic root of 128800993 is about 505.0174721923.

The spelling of 128800993 in words is "one hundred twenty-eight million, eight hundred thousand, nine hundred ninety-three".