136621647 has 48 divisors (see below), whose sum is σ = 218050560. Its totient is φ = 85240512.

The previous prime is 136621631. The next prime is 136621699. The reversal of 136621647 is 746126631.

It is a happy number.

136621647 is a `hidden beast` number, since 1 + 3 + 6 + 6 + 2 + 1 + 647 = 666.

It is not a de Polignac number, because 136621647 - 2⁴ = 136621631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136621607) 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 47 ways as a sum of consecutive naturals, for example, 586243 + ... + 586475.

It is an arithmetic number, because the mean of its divisors is an integer number (4542720).

Almost surely, 2^136621647 is an apocalyptic number.

136621647 is a deficient number, since it is larger than the sum of its proper divisors (81428913).

136621647 is a wasteful number, since it uses less digits than its factorization.

136621647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 382 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 136621647 is about 11688.5262971856. The cubic root of 136621647 is about 515.0386711779.

The spelling of 136621647 in words is "one hundred thirty-six million, six hundred twenty-one thousand, six hundred forty-seven".