128135520590 has 128 divisors (see below), whose sum is σ = 297236791296. Its totient is φ = 38597328000.

The previous prime is 128135520551. The next prime is 128135520659. The reversal of 128135520590 is 95025531821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19737245 + ... + 19743735.

It is an arithmetic number, because the mean of its divisors is an integer number (2322162432).

Almost surely, 2^128135520590 is an apocalyptic number.

128135520590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128135520590 is an abundant number, since it is smaller than the sum of its proper divisors (169101270706).

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

128135520590 is a wasteful number, since it uses less digits than its factorization.

128135520590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7374.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 128135520590 in words is "one hundred twenty-eight billion, one hundred thirty-five million, five hundred twenty thousand, five hundred ninety".