136881920 has 72 divisors (see below), whose sum is σ = 374738784. Its totient is φ = 46927872.

The previous prime is 136881919. The next prime is 136881923. The reversal of 136881920 is 29188631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136881923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1322 + ... + 16598.

Almost surely, 2^136881920 is an apocalyptic number.

136881920 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 136881920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187369392).

136881920 is an abundant number, since it is smaller than the sum of its proper divisors (237856864).

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

136881920 is an equidigital number, since it uses as much as digits as its factorization.

136881920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15305 (or 15291 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 136881920 is about 11699.6546957592. The cubic root of 136881920 is about 515.3655242741.

The spelling of 136881920 in words is "one hundred thirty-six million, eight hundred eighty-one thousand, nine hundred twenty".