128541638 has 4 divisors (see below), whose sum is σ = 192812460. Its totient is φ = 64270818.

The previous prime is 128541617. The next prime is 128541643. The reversal of 128541638 is 836145821.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32135408 + ... + 32135411.

It is an arithmetic number, because the mean of its divisors is an integer number (48203115).

Almost surely, 2^128541638 is an apocalyptic number.

128541638 is a deficient number, since it is larger than the sum of its proper divisors (64270822).

128541638 is an equidigital number, since it uses as much as digits as its factorization.

128541638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64270821.

The product of its digits is 46080, while the sum is 38.

The square root of 128541638 is about 11337.6204734503. The cubic root of 128541638 is about 504.6782749668.

The spelling of 128541638 in words is "one hundred twenty-eight million, five hundred forty-one thousand, six hundred thirty-eight".