128649075 has 24 divisors (see below), whose sum is σ = 220038000. Its totient is φ = 66245760.

The previous prime is 128649067. The next prime is 128649113. The reversal of 128649075 is 570946821.

It is not a de Polignac number, because 128649075 - 2³ = 128649067 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27400 + ... + 31749.

It is an arithmetic number, because the mean of its divisors is an integer number (9168250).

Almost surely, 2^128649075 is an apocalyptic number.

128649075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128649075 is a deficient number, since it is larger than the sum of its proper divisors (91388925).

128649075 is a wasteful number, since it uses less digits than its factorization.

128649075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59191 (or 59186 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 128649075 is about 11342.3575591673. The cubic root of 128649075 is about 504.8188416641.

The spelling of 128649075 in words is "one hundred twenty-eight million, six hundred forty-nine thousand, seventy-five".