67684643 has 4 divisors (see below), whose sum is σ = 72891168. Its totient is φ = 62478120.

The previous prime is 67684619. The next prime is 67684649. The reversal of 67684643 is 34648676.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 67684643 - 2²⁰ = 66636067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67684594 and 67684603.

It is not an unprimeable number, because it can be changed into a prime (67684649) 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, 2603243 + ... + 2603268.

It is an arithmetic number, because the mean of its divisors is an integer number (18222792).

Almost surely, 2^67684643 is an apocalyptic number.

67684643 is a deficient number, since it is larger than the sum of its proper divisors (5206525).

67684643 is a wasteful number, since it uses less digits than its factorization.

67684643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5206524.

The product of its digits is 580608, while the sum is 44.

The square root of 67684643 is about 8227.0677036232. The cubic root of 67684643 is about 407.5335624181.

It can be divided in two parts, 6768 and 4643, that added together give a palindrome (11411).

The spelling of 67684643 in words is "sixty-seven million, six hundred eighty-four thousand, six hundred forty-three".