68787729 has 24 divisors (see below), whose sum is σ = 108605952. Its totient is φ = 41765760.

The previous prime is 68787727. The next prime is 68787751. The reversal of 68787729 is 92778786.

It is not a de Polignac number, because 68787729 - 2¹ = 68787727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68787727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2509 + ... + 11994.

It is an arithmetic number, because the mean of its divisors is an integer number (4525248).

Almost surely, 2^68787729 is an apocalyptic number.

It is an amenable number.

68787729 is a deficient number, since it is larger than the sum of its proper divisors (39818223).

68787729 is a wasteful number, since it uses less digits than its factorization.

68787729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14557 (or 14554 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 68787729 is about 8293.8368081365. The cubic root of 68787729 is about 409.7355601954.

The spelling of 68787729 in words is "sixty-eight million, seven hundred eighty-seven thousand, seven hundred twenty-nine".