67728263 has 4 divisors (see below), whose sum is σ = 67814040. Its totient is φ = 67642488.

The previous prime is 67728259. The next prime is 67728281. The reversal of 67728263 is 36282776.

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

It is a cyclic number.

It is not a de Polignac number, because 67728263 - 2² = 67728259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67728263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67728203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41693 + ... + 43286.

It is an arithmetic number, because the mean of its divisors is an integer number (16953510).

Almost surely, 2^67728263 is an apocalyptic number.

67728263 is a deficient number, since it is larger than the sum of its proper divisors (85777).

67728263 is an equidigital number, since it uses as much as digits as its factorization.

67728263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85776.

The product of its digits is 169344, while the sum is 41.

The square root of 67728263 is about 8229.7182819341. The cubic root of 67728263 is about 407.6210898877.

The spelling of 67728263 in words is "sixty-seven million, seven hundred twenty-eight thousand, two hundred sixty-three".