67728713 has 4 divisors (see below), whose sum is σ = 72938628. Its totient is φ = 62518800.

The previous prime is 67728691. The next prime is 67728779. The reversal of 67728713 is 31782776.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28440889 + 39287824 = 5333^2 + 6268^2 .

It is a cyclic number.

It is not a de Polignac number, because 67728713 - 2⁶ = 67728649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67728113) 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 3 ways as a sum of consecutive naturals, for example, 2604938 + ... + 2604963.

It is an arithmetic number, because the mean of its divisors is an integer number (18234657).

Almost surely, 2^67728713 is an apocalyptic number.

It is an amenable number.

67728713 is a deficient number, since it is larger than the sum of its proper divisors (5209915).

67728713 is a wasteful number, since it uses less digits than its factorization.

67728713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5209914.

The product of its digits is 98784, while the sum is 41.

The square root of 67728713 is about 8229.7456218282. The cubic root of 67728713 is about 407.6219926575.

The spelling of 67728713 in words is "sixty-seven million, seven hundred twenty-eight thousand, seven hundred thirteen".