135208545990 has 128 divisors (see below), whose sum is σ = 375238656000. Its totient is φ = 30540993408.

The previous prime is 135208545971. The next prime is 135208546021. The reversal of 135208545990 is 99545802531.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10787107 + ... + 10799633.

It is an arithmetic number, because the mean of its divisors is an integer number (2931552000).

Almost surely, 2^135208545990 is an apocalyptic number.

135208545990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 135208545990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187619328000).

135208545990 is an abundant number, since it is smaller than the sum of its proper divisors (240030110010).

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

135208545990 is a wasteful number, since it uses less digits than its factorization.

135208545990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13146.

The product of its (nonzero) digits is 1944000, while the sum is 51.

The spelling of 135208545990 in words is "one hundred thirty-five billion, two hundred eight million, five hundred forty-five thousand, nine hundred ninety".