136981580 has 48 divisors (see below), whose sum is σ = 308810880. Its totient is φ = 50853888.

The previous prime is 136981549. The next prime is 136981601. The reversal of 136981580 is 85189631.

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, 22061 + ... + 27579.

It is an arithmetic number, because the mean of its divisors is an integer number (6433560).

Almost surely, 2^136981580 is an apocalyptic number.

136981580 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 136981580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154405440).

136981580 is an abundant number, since it is smaller than the sum of its proper divisors (171829300).

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

136981580 is a wasteful number, since it uses less digits than its factorization.

136981580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5618 (or 5616 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 136981580 is about 11703.9130208661. The cubic root of 136981580 is about 515.4905684686.

The spelling of 136981580 in words is "one hundred thirty-six million, nine hundred eighty-one thousand, five hundred eighty".