68143729 has 4 divisors (see below), whose sum is σ = 68160240. Its totient is φ = 68127220.

The previous prime is 68143723. The next prime is 68143781. The reversal of 68143729 is 92734186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68143729 - 2³ = 68143721 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68143691 and 68143700.

It is not an unprimeable number, because it can be changed into a prime (68143721) 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 3 ways as a sum of consecutive naturals, for example, 4074 + ... + 12364.

It is an arithmetic number, because the mean of its divisors is an integer number (17040060).

Almost surely, 2^68143729 is an apocalyptic number.

It is an amenable number.

68143729 is a deficient number, since it is larger than the sum of its proper divisors (16511).

68143729 is an equidigital number, since it uses as much as digits as its factorization.

68143729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16510.

The product of its digits is 72576, while the sum is 40.

The square root of 68143729 is about 8254.9215017467. The cubic root of 68143729 is about 408.4528824284.

The spelling of 68143729 in words is "sixty-eight million, one hundred forty-three thousand, seven hundred twenty-nine".