136731240 has 144 divisors (see below), whose sum is σ = 462330180. Its totient is φ = 36391680.

The previous prime is 136731223. The next prime is 136731241. The reversal of 136731240 is 42137631.

It can be written as a sum of positive squares in 2 ways, for example, as 132296004 + 4435236 = 11502^2 + 2106^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (136731241) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 262180 + ... + 262700.

Almost surely, 2^136731240 is an apocalyptic number.

136731240 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 136731240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231165090).

136731240 is an abundant number, since it is smaller than the sum of its proper divisors (325598940).

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

136731240 is an frugal number, since it uses more digits than its factorization.

136731240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 136731240 is about 11693.2134163368. The cubic root of 136731240 is about 515.1763495727.

Adding to 136731240 its reverse (42137631), we get a palindrome (178868871).

The spelling of 136731240 in words is "one hundred thirty-six million, seven hundred thirty-one thousand, two hundred forty".