136781447 has 8 divisors (see below), whose sum is σ = 149670912. Its totient is φ = 123967800.

The previous prime is 136781443. The next prime is 136781497. The reversal of 136781447 is 744187631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 136781447 - 2² = 136781443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136781443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15143 + ... + 22424.

It is an arithmetic number, because the mean of its divisors is an integer number (18708864).

Almost surely, 2^136781447 is an apocalyptic number.

136781447 is a deficient number, since it is larger than the sum of its proper divisors (12889465).

136781447 is a wasteful number, since it uses less digits than its factorization.

136781447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37909.

The product of its digits is 112896, while the sum is 41.

The square root of 136781447 is about 11695.3600628625. The cubic root of 136781447 is about 515.2393985481.

The spelling of 136781447 in words is "one hundred thirty-six million, seven hundred eighty-one thousand, four hundred forty-seven".