128135644 has 24 divisors (see below), whose sum is σ = 275985248. Its totient is φ = 50690880.

The previous prime is 128135641. The next prime is 128135663. The reversal of 128135644 is 446531821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128135641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175647 + ... + 176374.

Almost surely, 2^128135644 is an apocalyptic number.

128135644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128135644 is an abundant number, since it is smaller than the sum of its proper divisors (147849604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128135644 is a wasteful number, since it uses less digits than its factorization.

128135644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352045 (or 352043 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 128135644 is about 11319.7015861727. The cubic root of 128135644 is about 504.1463787054.

The spelling of 128135644 in words is "one hundred twenty-eight million, one hundred thirty-five thousand, six hundred forty-four".