128797 has 6 divisors (see below), whose sum is σ = 134558. Its totient is φ = 123192.

The previous prime is 128767. The next prime is 128813. The reversal of 128797 is 797821.

128797 = T₁₈ + T₁₉ + ... + T₉₁.

It can be written as a sum of positive squares in only one way, i.e., 125316 + 3481 = 354^2 + 59^2 .

It is not a de Polignac number, because 128797 - 2⁷ = 128669 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 (128717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2154 + ... + 2212.

2¹²⁸⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

128797 is a deficient number, since it is larger than the sum of its proper divisors (5761).

128797 is an frugal number, since it uses more digits than its factorization.

128797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 96 counting only the distinct ones).

The product of its digits is 7056, while the sum is 34.

The square root of 128797 is about 358.8829892876. The cubic root of 128797 is about 50.5012253403.

The spelling of 128797 in words is "one hundred twenty-eight thousand, seven hundred ninety-seven".