67686971 has 4 divisors (see below), whose sum is σ = 73840344. Its totient is φ = 61533600.

The previous prime is 67686961. The next prime is 67686991. The reversal of 67686971 is 17968676.

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 67686971 - 2¹⁸ = 67424827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67686961) 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, 3076670 + ... + 3076691.

It is an arithmetic number, because the mean of its divisors is an integer number (18460086).

Almost surely, 2^67686971 is an apocalyptic number.

67686971 is a deficient number, since it is larger than the sum of its proper divisors (6153373).

67686971 is a wasteful number, since it uses less digits than its factorization.

67686971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6153372.

The product of its digits is 762048, while the sum is 50.

The square root of 67686971 is about 8227.2091865954. The cubic root of 67686971 is about 407.5382347102.

The spelling of 67686971 in words is "sixty-seven million, six hundred eighty-six thousand, nine hundred seventy-one".