68685729 has 32 divisors (see below), whose sum is σ = 111326976. Its totient is φ = 36771840.

The previous prime is 68685719. The next prime is 68685731. The reversal of 68685729 is 92758686.

It is not a de Polignac number, because 68685729 - 2⁴ = 68685713 is a prime.

It is a super-2 number, since 2×68685729² = 9435458736522882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (68685719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150069 + ... + 150525.

It is an arithmetic number, because the mean of its divisors is an integer number (3478968).

Almost surely, 2^68685729 is an apocalyptic number.

It is an amenable number.

68685729 is a deficient number, since it is larger than the sum of its proper divisors (42641247).

68685729 is a wasteful number, since it uses less digits than its factorization.

68685729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905.

The product of its digits is 1451520, while the sum is 51.

The square root of 68685729 is about 8287.6853825420. The cubic root of 68685729 is about 409.5329382937.

The spelling of 68685729 in words is "sixty-eight million, six hundred eighty-five thousand, seven hundred twenty-nine".