128725835 has 8 divisors (see below), whose sum is σ = 176538336. Its totient is φ = 88269120.

The previous prime is 128725829. The next prime is 128725837. The reversal of 128725835 is 538527821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128725835 - 2¹⁶ = 128660299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128725792 and 128725801.

It is not an unprimeable number, because it can be changed into a prime (128725837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1838906 + ... + 1838975.

It is an arithmetic number, because the mean of its divisors is an integer number (22067292).

Almost surely, 2^128725835 is an apocalyptic number.

128725835 is a deficient number, since it is larger than the sum of its proper divisors (47812501).

128725835 is an equidigital number, since it uses as much as digits as its factorization.

128725835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677893.

The product of its digits is 134400, while the sum is 41.

The square root of 128725835 is about 11345.7408308140. The cubic root of 128725835 is about 504.9192237564.

The spelling of 128725835 in words is "one hundred twenty-eight million, seven hundred twenty-five thousand, eight hundred thirty-five".