128785773 has 4 divisors (see below), whose sum is σ = 171714368. Its totient is φ = 85857180.

The previous prime is 128785771. The next prime is 128785801. The reversal of 128785773 is 377587821.

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 not a de Polignac number, because 128785773 - 2¹ = 128785771 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 (128785771) 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, 21464293 + ... + 21464298.

It is an arithmetic number, because the mean of its divisors is an integer number (42928592).

Almost surely, 2^128785773 is an apocalyptic number.

It is an amenable number.

128785773 is a deficient number, since it is larger than the sum of its proper divisors (42928595).

128785773 is an equidigital number, since it uses as much as digits as its factorization.

128785773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42928594.

The product of its digits is 658560, while the sum is 48.

The square root of 128785773 is about 11348.3819551511. The cubic root of 128785773 is about 504.9975793107.

The spelling of 128785773 in words is "one hundred twenty-eight million, seven hundred eighty-five thousand, seven hundred seventy-three".