128643425 has 12 divisors (see below), whose sum is σ = 161012016. Its totient is φ = 101950800.

The previous prime is 128643421. The next prime is 128643457. The reversal of 128643425 is 524346821.

It is not a de Polignac number, because 128643425 - 2² = 128643421 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128643421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21371 + ... + 26720.

It is an arithmetic number, because the mean of its divisors is an integer number (13417668).

Almost surely, 2^128643425 is an apocalyptic number.

It is an amenable number.

128643425 is a deficient number, since it is larger than the sum of its proper divisors (32368591).

128643425 is a wasteful number, since it uses less digits than its factorization.

128643425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48208 (or 48203 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 128643425 is about 11342.1084900472. The cubic root of 128643425 is about 504.8114513578.

The spelling of 128643425 in words is "one hundred twenty-eight million, six hundred forty-three thousand, four hundred twenty-five".