136881520 has 20 divisors (see below), whose sum is σ = 318249720. Its totient is φ = 54752576.

The previous prime is 136881419. The next prime is 136881527. The reversal of 136881520 is 25188631.

136881520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136881527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 855430 + ... + 855589.

It is an arithmetic number, because the mean of its divisors is an integer number (15912486).

Almost surely, 2^136881520 is an apocalyptic number.

136881520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136881520 is an abundant number, since it is smaller than the sum of its proper divisors (181368200).

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

136881520 is a wasteful number, since it uses less digits than its factorization.

136881520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711032 (or 1711026 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 136881520 is about 11699.6376012251. The cubic root of 136881520 is about 515.3650222687.

It can be divided in two parts, 1368815 and 20, that multiplied together give a triangular number (27376300 = T₇₃₉₉).

The spelling of 136881520 in words is "one hundred thirty-six million, eight hundred eighty-one thousand, five hundred twenty".