67889921 has 8 divisors (see below), whose sum is σ = 74186688. Its totient is φ = 61614000.

The previous prime is 67889903. The next prime is 67889971. The reversal of 67889921 is 12998876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67889921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67889921.

It is not an unprimeable number, because it can be changed into a prime (67889971) 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 7 ways as a sum of consecutive naturals, for example, 2051 + ... + 11831.

It is an arithmetic number, because the mean of its divisors is an integer number (9273336).

Almost surely, 2^67889921 is an apocalyptic number.

It is an amenable number.

67889921 is a deficient number, since it is larger than the sum of its proper divisors (6296767).

67889921 is a wasteful number, since it uses less digits than its factorization.

67889921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10423.

The product of its digits is 435456, while the sum is 50.

The square root of 67889921 is about 8239.5340280868. The cubic root of 67889921 is about 407.9451439289.

It can be divided in two parts, 67 and 889921, that added together give a palindrome (889988).

The spelling of 67889921 in words is "sixty-seven million, eight hundred eighty-nine thousand, nine hundred twenty-one".