67273721 has 2 divisors, whose sum is σ = 67273722. Its totient is φ = 67273720.

The previous prime is 67273697. The next prime is 67273757. The reversal of 67273721 is 12737276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64176121 + 3097600 = 8011^2 + 1760^2 .

It is a cyclic number.

It is not a de Polignac number, because 67273721 - 2²² = 63079417 is a prime.

It is not a weakly prime, because it can be changed into another prime (67273771) 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, 33636860 + 33636861.

It is an arithmetic number, because the mean of its divisors is an integer number (33636861).

Almost surely, 2^67273721 is an apocalyptic number.

It is an amenable number.

67273721 is a deficient number, since it is larger than the sum of its proper divisors (1).

67273721 is an equidigital number, since it uses as much as digits as its factorization.

67273721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24696, while the sum is 35.

The square root of 67273721 is about 8202.0559008093. The cubic root of 67273721 is about 406.7071585439.

It can be divided in two parts, 6 and 7273721, that added together give a palindrome (7273727).

The spelling of 67273721 in words is "sixty-seven million, two hundred seventy-three thousand, seven hundred twenty-one".