800128799 has 4 divisors (see below), whose sum is σ = 817152864. Its totient is φ = 783104736.

The previous prime is 800128787. The next prime is 800128841. The reversal of 800128799 is 997821008.

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

It is a cyclic number.

It is not a de Polignac number, because 800128799 - 2⁸ = 800128543 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 (800128099) 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, 8511962 + ... + 8512055.

It is an arithmetic number, because the mean of its divisors is an integer number (204288216).

Almost surely, 2^800128799 is an apocalyptic number.

800128799 is a deficient number, since it is larger than the sum of its proper divisors (17024065).

800128799 is a wasteful number, since it uses less digits than its factorization.

800128799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17024064.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 800128799 is about 28286.5480219839. The cubic root of 800128799 is about 928.3675833825.

The spelling of 800128799 in words is "eight hundred million, one hundred twenty-eight thousand, seven hundred ninety-nine".