136971720 has 96 divisors (see below), whose sum is σ = 471364920. Its totient is φ = 34375680.

The previous prime is 136971697. The next prime is 136971721. The reversal of 136971720 is 27179631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 127644804 + 9326916 = 11298^2 + 3054^2 .

It is a super-2 number, since 2×136971720² = 37522504159516800, which contains 22 as substring.

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 (136971721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5071 + ... + 17310.

Almost surely, 2^136971720 is an apocalyptic number.

136971720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136971720 is an abundant number, since it is smaller than the sum of its proper divisors (334393200).

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

136971720 is a wasteful number, since it uses less digits than its factorization.

136971720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22415 (or 22408 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 136971720 is about 11703.4917866421. The cubic root of 136971720 is about 515.4781997521.

The spelling of 136971720 in words is "one hundred thirty-six million, nine hundred seventy-one thousand, seven hundred twenty".