136581220 has 24 divisors (see below), whose sum is σ = 289505664. Its totient is φ = 54121056.

The previous prime is 136581197. The next prime is 136581223. The reversal of 136581220 is 22185631.

It is not an unprimeable number, because it can be changed into a prime (136581223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29772 + ... + 34051.

It is an arithmetic number, because the mean of its divisors is an integer number (12062736).

Almost surely, 2^136581220 is an apocalyptic number.

136581220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136581220 is an abundant number, since it is smaller than the sum of its proper divisors (152924444).

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

136581220 is a wasteful number, since it uses less digits than its factorization.

136581220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63939 (or 63937 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 136581220 is about 11686.7968237666. The cubic root of 136581220 is about 514.9878653627.

It can be divided in two parts, 13658 and 1220, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 136581220 in words is "one hundred thirty-six million, five hundred eighty-one thousand, two hundred twenty".