128712725 has 12 divisors (see below), whose sum is σ = 161626560. Its totient is φ = 101665200.

The previous prime is 128712719. The next prime is 128712739. The reversal of 128712725 is 527217821.

It is not a de Polignac number, because 128712725 - 2²⁰ = 127664149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30611 + ... + 34560.

It is an arithmetic number, because the mean of its divisors is an integer number (13468880).

Almost surely, 2^128712725 is an apocalyptic number.

It is an amenable number.

128712725 is a deficient number, since it is larger than the sum of its proper divisors (32913835).

128712725 is an equidigital number, since it uses as much as digits as its factorization.

128712725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65260 (or 65255 counting only the distinct ones).

The product of its digits is 15680, while the sum is 35.

The square root of 128712725 is about 11345.1630662587. The cubic root of 128712725 is about 504.9020821165.

The spelling of 128712725 in words is "one hundred twenty-eight million, seven hundred twelve thousand, seven hundred twenty-five".