67343721 has 16 divisors (see below), whose sum is σ = 91665600. Its totient is φ = 43964928.

The previous prime is 67343711. The next prime is 67343723. The reversal of 67343721 is 12734376.

It is not a de Polignac number, because 67343721 - 2⁹ = 67343209 is a prime.

It is a super-3 number, since 3×67343721³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (67343723) 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 15 ways as a sum of consecutive naturals, for example, 59085 + ... + 60213.

It is an arithmetic number, because the mean of its divisors is an integer number (5729100).

Almost surely, 2^67343721 is an apocalyptic number.

It is an amenable number.

67343721 is a deficient number, since it is larger than the sum of its proper divisors (24321879).

67343721 is a wasteful number, since it uses less digits than its factorization.

67343721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528.

The product of its digits is 21168, while the sum is 33.

The square root of 67343721 is about 8206.3220141547. The cubic root of 67343721 is about 406.8481726574.

The spelling of 67343721 in words is "sixty-seven million, three hundred forty-three thousand, seven hundred twenty-one".