128772273 has 32 divisors (see below), whose sum is σ = 200344320. Its totient is φ = 72057600.

The previous prime is 128772271. The next prime is 128772277. The reversal of 128772273 is 372277821.

It is not a de Polignac number, because 128772273 - 2¹ = 128772271 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (128772271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230911 + ... + 231467.

It is an arithmetic number, because the mean of its divisors is an integer number (6260760).

Almost surely, 2^128772273 is an apocalyptic number.

It is an amenable number.

128772273 is a deficient number, since it is larger than the sum of its proper divisors (71572047).

128772273 is a wasteful number, since it uses less digits than its factorization.

128772273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777.

The product of its digits is 65856, while the sum is 39.

The square root of 128772273 is about 11347.7871411126. The cubic root of 128772273 is about 504.9799331960.

The spelling of 128772273 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, two hundred seventy-three".