128725555 has 16 divisors (see below), whose sum is σ = 179434944. Its totient is φ = 86820480.

The previous prime is 128725543. The next prime is 128725561. The reversal of 128725555 is 555527821.

It is not a de Polignac number, because 128725555 - 2⁷ = 128725427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28012 + ... + 32281.

It is an arithmetic number, because the mean of its divisors is an integer number (11214684).

Almost surely, 2^128725555 is an apocalyptic number.

128725555 is a deficient number, since it is larger than the sum of its proper divisors (50709389).

128725555 is an equidigital number, since it uses as much as digits as its factorization.

128725555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60366.

The product of its digits is 140000, while the sum is 40.

The square root of 128725555 is about 11345.7284913751. The cubic root of 128725555 is about 504.9188576619.

The spelling of 128725555 in words is "one hundred twenty-eight million, seven hundred twenty-five thousand, five hundred fifty-five".