135989880 has 128 divisors (see below), whose sum is σ = 442713600. Its totient is φ = 33219072.

The previous prime is 135989873. The next prime is 135989957. The reversal of 135989880 is 88989531.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278997 + ... + 279483.

It is an arithmetic number, because the mean of its divisors is an integer number (3458700).

Almost surely, 2^135989880 is an apocalyptic number.

135989880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135989880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221356800).

135989880 is an abundant number, since it is smaller than the sum of its proper divisors (306723720).

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

135989880 is a wasteful number, since it uses less digits than its factorization.

135989880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 51.

The square root of 135989880 is about 11661.4698901982. The cubic root of 135989880 is about 514.2435622419.

The spelling of 135989880 in words is "one hundred thirty-five million, nine hundred eighty-nine thousand, eight hundred eighty".