136531440 has 160 divisors (see below), whose sum is σ = 485683200. Its totient is φ = 35216640.

The previous prime is 136531433. The next prime is 136531469. The reversal of 136531440 is 44135631.

136531440 is a `hidden beast` number, since 1 + 3 + 653 + 1 + 4 + 4 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65941 + ... + 67979.

It is an arithmetic number, because the mean of its divisors is an integer number (3035520).

Almost surely, 2^136531440 is an apocalyptic number.

136531440 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 136531440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242841600).

136531440 is an abundant number, since it is smaller than the sum of its proper divisors (349151760).

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

136531440 is a wasteful number, since it uses less digits than its factorization.

136531440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092 (or 2080 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 136531440 is about 11684.6668758677. Note that the first 3 decimals coincide. The cubic root of 136531440 is about 514.9252915791.

The spelling of 136531440 in words is "one hundred thirty-six million, five hundred thirty-one thousand, four hundred forty".