136581808 has 80 divisors (see below), whose sum is σ = 308551680. Its totient is φ = 57881600.

The previous prime is 136581787. The next prime is 136581821. The reversal of 136581808 is 808185631.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 571353 + ... + 571591.

It is an arithmetic number, because the mean of its divisors is an integer number (3856896).

Almost surely, 2^136581808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 136581808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154275840).

136581808 is an abundant number, since it is smaller than the sum of its proper divisors (171969872).

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

136581808 is a wasteful number, since it uses less digits than its factorization.

136581808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 136581808 is about 11686.8219803332. The cubic root of 136581808 is about 514.9886043917.

The spelling of 136581808 in words is "one hundred thirty-six million, five hundred eighty-one thousand, eight hundred eight".