128020125 has 32 divisors (see below), whose sum is σ = 213767424. Its totient is φ = 68040000.

The previous prime is 128020121. The next prime is 128020141. The reversal of 128020125 is 521020821.

It is a happy number.

It is not a de Polignac number, because 128020125 - 2² = 128020121 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128020121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182275 + ... + 182975.

It is an arithmetic number, because the mean of its divisors is an integer number (6680232).

Almost surely, 2^128020125 is an apocalyptic number.

128020125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128020125 is a deficient number, since it is larger than the sum of its proper divisors (85747299).

128020125 is an equidigital number, since it uses as much as digits as its factorization.

128020125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 1196 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 128020125 is about 11314.5978717761. The cubic root of 128020125 is about 503.9948309813.

Adding to 128020125 its reverse (521020821), we get a palindrome (649040946).

The spelling of 128020125 in words is "one hundred twenty-eight million, twenty thousand, one hundred twenty-five".