136581380 has 24 divisors (see below), whose sum is σ = 308884632. Its totient is φ = 50429952.

The previous prime is 136581377. The next prime is 136581407. The reversal of 136581380 is 83185631.

It can be written as a sum of positive squares in 4 ways, for example, as 9388096 + 127193284 = 3064^2 + 11278^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 136581380.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262397 + ... + 262916.

It is an arithmetic number, because the mean of its divisors is an integer number (12870193).

Almost surely, 2^136581380 is an apocalyptic number.

136581380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136581380 is an abundant number, since it is smaller than the sum of its proper divisors (172303252).

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

136581380 is a wasteful number, since it uses less digits than its factorization.

136581380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525335 (or 525333 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 136581380 is about 11686.8036690962. The cubic root of 136581380 is about 514.9880664593.

The spelling of 136581380 in words is "one hundred thirty-six million, five hundred eighty-one thousand, three hundred eighty".