67721743 has 2 divisors, whose sum is σ = 67721744. Its totient is φ = 67721742.

The previous prime is 67721741. The next prime is 67721747. The reversal of 67721743 is 34712776.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67721743 - 2¹ = 67721741 is a prime.

Together with 67721741, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67721741) 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 as a sum of consecutive naturals, namely, 33860871 + 33860872.

It is an arithmetic number, because the mean of its divisors is an integer number (33860872).

Almost surely, 2^67721743 is an apocalyptic number.

67721743 is a deficient number, since it is larger than the sum of its proper divisors (1).

67721743 is an equidigital number, since it uses as much as digits as its factorization.

67721743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 37.

The square root of 67721743 is about 8229.3221470544. The cubic root of 67721743 is about 407.6080093082.

It can be divided in two parts, 6772 and 1743, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 67721743 in words is "sixty-seven million, seven hundred twenty-one thousand, seven hundred forty-three".