67684321 has 4 divisors (see below), whose sum is σ = 67720212. Its totient is φ = 67648432.

The previous prime is 67684307. The next prime is 67684381. The reversal of 67684321 is 12348676.

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 21986721 + 45697600 = 4689^2 + 6760^2 .

It is a cyclic number.

It is not a de Polignac number, because 67684321 - 2¹³ = 67676129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67684381) 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 3 ways as a sum of consecutive naturals, for example, 14950 + ... + 18943.

It is an arithmetic number, because the mean of its divisors is an integer number (16930053).

Almost surely, 2^67684321 is an apocalyptic number.

It is an amenable number.

67684321 is a deficient number, since it is larger than the sum of its proper divisors (35891).

67684321 is a wasteful number, since it uses less digits than its factorization.

67684321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35890.

The product of its digits is 48384, while the sum is 37.

The square root of 67684321 is about 8227.0481340515. The cubic root of 67684321 is about 407.5329161563.

The spelling of 67684321 in words is "sixty-seven million, six hundred eighty-four thousand, three hundred twenty-one".