135236381820 has 96 divisors (see below), whose sum is σ = 387715845888. Its totient is φ = 35210284032.

The previous prime is 135236381783. The next prime is 135236381821. The reversal of 135236381820 is 28183632531.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135236381821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305407 + ... + 603113.

It is an arithmetic number, because the mean of its divisors is an integer number (4038706728).

Almost surely, 2^135236381820 is an apocalyptic number.

135236381820 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 135236381820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193857922944).

135236381820 is an abundant number, since it is smaller than the sum of its proper divisors (252479464068).

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

135236381820 is a wasteful number, since it uses less digits than its factorization.

135236381820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297899 (or 297897 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 135236381820 in words is "one hundred thirty-five billion, two hundred thirty-six million, three hundred eighty-one thousand, eight hundred twenty".