128807137 has 4 divisors (see below), whose sum is σ = 135586480. Its totient is φ = 122027796.

The previous prime is 128807131. The next prime is 128807179. The reversal of 128807137 is 731708821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 731708821 = 23 ⋅31813427.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128807137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128807096 and 128807105.

It is not an unprimeable number, because it can be changed into a prime (128807131) 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, 3389643 + ... + 3389680.

It is an arithmetic number, because the mean of its divisors is an integer number (33896620).

Almost surely, 2^128807137 is an apocalyptic number.

It is an amenable number.

128807137 is a deficient number, since it is larger than the sum of its proper divisors (6779343).

128807137 is an equidigital number, since it uses as much as digits as its factorization.

128807137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779342.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 128807137 is about 11349.3231956800. The cubic root of 128807137 is about 505.0255020942.

The spelling of 128807137 in words is "one hundred twenty-eight million, eight hundred seven thousand, one hundred thirty-seven".