136668220 has 48 divisors (see below), whose sum is σ = 309955968. Its totient is φ = 50319360.

The previous prime is 136668209. The next prime is 136668221. The reversal of 136668220 is 22866631.

136668220 = T₂₅ + T₂₆ + ... + T₉₃₅.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136668221) 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 15 ways as a sum of consecutive naturals, for example, 149565 + ... + 150475.

It is an arithmetic number, because the mean of its divisors is an integer number (6457416).

Almost surely, 2^136668220 is an apocalyptic number.

136668220 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 136668220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154977984).

136668220 is an abundant number, since it is smaller than the sum of its proper divisors (173287748).

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

136668220 is a wasteful number, since it uses less digits than its factorization.

136668220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 136668220 is about 11690.5183802943. The cubic root of 136668220 is about 515.0971884320.

The spelling of 136668220 in words is "one hundred thirty-six million, six hundred sixty-eight thousand, two hundred twenty".