136831680 has 140 divisors (see below), whose sum is σ = 486826560. Its totient is φ = 36481536.

The previous prime is 136831663. The next prime is 136831687. The reversal of 136831680 is 86138631.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (136831687) 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 19 ways as a sum of consecutive naturals, for example, 23281 + ... + 28559.

Almost surely, 2^136831680 is an apocalyptic number.

136831680 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 136831680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243413280).

136831680 is an abundant number, since it is smaller than the sum of its proper divisors (349994880).

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

136831680 is an equidigital number, since it uses as much as digits as its factorization.

136831680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308 (or 5289 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 136831680 is about 11697.5074267982. The cubic root of 136831680 is about 515.3024647351.

The spelling of 136831680 in words is "one hundred thirty-six million, eight hundred thirty-one thousand, six hundred eighty".