68667729 has 16 divisors (see below), whose sum is σ = 103790400. Its totient is φ = 40032576.

The previous prime is 68667713. The next prime is 68667733. The reversal of 68667729 is 92776686.

It is not a de Polignac number, because 68667729 - 2⁴ = 68667713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68667749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45594 + ... + 47075.

It is an arithmetic number, because the mean of its divisors is an integer number (6486900).

Almost surely, 2^68667729 is an apocalyptic number.

It is an amenable number.

68667729 is a deficient number, since it is larger than the sum of its proper divisors (35122671).

68667729 is a wasteful number, since it uses less digits than its factorization.

68667729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92704.

The product of its digits is 1524096, while the sum is 51.

The square root of 68667729 is about 8286.5993628267. The cubic root of 68667729 is about 409.4971606679.

It can be divided in two parts, 68667 and 729, that added together give a palindrome (69396).

The spelling of 68667729 in words is "sixty-eight million, six hundred sixty-seven thousand, seven hundred twenty-nine".