67728841 has 2 divisors, whose sum is σ = 67728842. Its totient is φ = 67728840.

The previous prime is 67728839. The next prime is 67728851. The reversal of 67728841 is 14882776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44890000 + 22838841 = 6700^2 + 4779^2 .

It is a cyclic number.

It is not a de Polignac number, because 67728841 - 2¹ = 67728839 is a prime.

Together with 67728839, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (67728851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33864420 + 33864421.

It is an arithmetic number, because the mean of its divisors is an integer number (33864421).

Almost surely, 2^67728841 is an apocalyptic number.

It is an amenable number.

67728841 is a deficient number, since it is larger than the sum of its proper divisors (1).

67728841 is an equidigital number, since it uses as much as digits as its factorization.

67728841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 43.

The square root of 67728841 is about 8229.7533984926. The cubic root of 67728841 is about 407.6222494446.

It can be divided in two parts, 677288 and 41, that added together give a square (677329 = 823²).

The spelling of 67728841 in words is "sixty-seven million, seven hundred twenty-eight thousand, eight hundred forty-one".