67889687 has 4 divisors (see below), whose sum is σ = 71883216. Its totient is φ = 63896160.

The previous prime is 67889683. The next prime is 67889711. The reversal of 67889687 is 78698876.

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 67889687 - 2² = 67889683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67889683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1996739 + ... + 1996772.

It is an arithmetic number, because the mean of its divisors is an integer number (17970804).

Almost surely, 2^67889687 is an apocalyptic number.

67889687 is a deficient number, since it is larger than the sum of its proper divisors (3993529).

67889687 is a wasteful number, since it uses less digits than its factorization.

67889687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993528.

The product of its digits is 8128512, while the sum is 59.

The square root of 67889687 is about 8239.5198282424. The cubic root of 67889687 is about 407.9446752325.

The spelling of 67889687 in words is "sixty-seven million, eight hundred eighty-nine thousand, six hundred eighty-seven".