128340025 has 24 divisors (see below), whose sum is σ = 174122784. Its totient is φ = 93062400.

The previous prime is 128340011. The next prime is 128340029. The reversal of 128340025 is 520043821.

It is not a de Polignac number, because 128340025 - 2¹¹ = 128337977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (128340029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162682 + ... + 163468.

It is an arithmetic number, because the mean of its divisors is an integer number (7255116).

Almost surely, 2^128340025 is an apocalyptic number.

It is an amenable number.

128340025 is a deficient number, since it is larger than the sum of its proper divisors (45782759).

128340025 is a wasteful number, since it uses less digits than its factorization.

128340025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401 (or 1396 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 128340025 is about 11328.7256564893. The cubic root of 128340025 is about 504.4142802385.

Adding to 128340025 its reverse (520043821), we get a palindrome (648383846).

The spelling of 128340025 in words is "one hundred twenty-eight million, three hundred forty thousand, twenty-five".