67889491 has 4 divisors (see below), whose sum is σ = 70841232. Its totient is φ = 64937752.

The previous prime is 67889429. The next prime is 67889513. The reversal of 67889491 is 19498876.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67889491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67889791) 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, 1475836 + ... + 1475881.

It is an arithmetic number, because the mean of its divisors is an integer number (17710308).

Almost surely, 2^67889491 is an apocalyptic number.

67889491 is a deficient number, since it is larger than the sum of its proper divisors (2951741).

67889491 is a wasteful number, since it uses less digits than its factorization.

67889491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951740.

The product of its digits is 870912, while the sum is 52.

The square root of 67889491 is about 8239.5079343369. The cubic root of 67889491 is about 407.9442826484.

The spelling of 67889491 in words is "sixty-seven million, eight hundred eighty-nine thousand, four hundred ninety-one".