68129547 has 4 divisors (see below), whose sum is σ = 90839400. Its totient is φ = 45419696.

The previous prime is 68129533. The next prime is 68129549. The reversal of 68129547 is 74592186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68129547 - 2⁸ = 68129291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68129499 and 68129508.

It is not an unprimeable number, because it can be changed into a prime (68129549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11354922 + ... + 11354927.

It is an arithmetic number, because the mean of its divisors is an integer number (22709850).

Almost surely, 2^68129547 is an apocalyptic number.

68129547 is a deficient number, since it is larger than the sum of its proper divisors (22709853).

68129547 is a wasteful number, since it uses less digits than its factorization.

68129547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22709852.

The product of its digits is 120960, while the sum is 42.

The square root of 68129547 is about 8254.0624543312. The cubic root of 68129547 is about 408.4245448701.

The spelling of 68129547 in words is "sixty-eight million, one hundred twenty-nine thousand, five hundred forty-seven".