136881820 has 12 divisors (see below), whose sum is σ = 287451864. Its totient is φ = 54752720.

The previous prime is 136881817. The next prime is 136881839. The reversal of 136881820 is 28188631.

136881820 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is a self number, because there is not a number n which added to its sum of digits gives 136881820.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3422026 + ... + 3422065.

It is an arithmetic number, because the mean of its divisors is an integer number (23954322).

Almost surely, 2^136881820 is an apocalyptic number.

136881820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136881820 is an abundant number, since it is smaller than the sum of its proper divisors (150570044).

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

136881820 is a wasteful number, since it uses less digits than its factorization.

136881820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6844100 (or 6844098 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 136881820 is about 11699.6504221280. The cubic root of 136881820 is about 515.3653987728.

The spelling of 136881820 in words is "one hundred thirty-six million, eight hundred eighty-one thousand, eight hundred twenty".