136691208 has 96 divisors (see below), whose sum is σ = 389188800. Its totient is φ = 43257984.

The previous prime is 136691207. The next prime is 136691227. The reversal of 136691208 is 802196631.

136691208 is a `hidden beast` number, since 1 + 366 + 91 + 208 = 666.

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 (136691207) 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 23 ways as a sum of consecutive naturals, for example, 326023 + ... + 326441.

It is an arithmetic number, because the mean of its divisors is an integer number (4054050).

Almost surely, 2^136691208 is an apocalyptic number.

136691208 is a gapful number since it is divisible by the number (18) 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 136691208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194594400).

136691208 is an abundant number, since it is smaller than the sum of its proper divisors (252497592).

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

136691208 is a wasteful number, since it uses less digits than its factorization.

136691208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 136691208 is about 11691.5015288884. The cubic root of 136691208 is about 515.1260671046.

The spelling of 136691208 in words is "one hundred thirty-six million, six hundred ninety-one thousand, two hundred eight".