67384721 has 4 divisors (see below), whose sum is σ = 67497444. Its totient is φ = 67272000.

The previous prime is 67384693. The next prime is 67384739. The reversal of 67384721 is 12748376.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26884225 + 40500496 = 5185^2 + 6364^2 .

It is a cyclic number.

It is not a de Polignac number, because 67384721 - 2¹⁴ = 67368337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67384021) 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, 55460 + ... + 56661.

It is an arithmetic number, because the mean of its divisors is an integer number (16874361).

Almost surely, 2^67384721 is an apocalyptic number.

It is an amenable number.

67384721 is a deficient number, since it is larger than the sum of its proper divisors (112723).

67384721 is a wasteful number, since it uses less digits than its factorization.

67384721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112722.

The product of its digits is 56448, while the sum is 38.

The square root of 67384721 is about 8208.8197080945. The cubic root of 67384721 is about 406.9307212642.

The spelling of 67384721 in words is "sixty-seven million, three hundred eighty-four thousand, seven hundred twenty-one".