67666389 has 8 divisors (see below), whose sum is σ = 103110720. Its totient is φ = 38666496.

The previous prime is 67666387. The next prime is 67666393. The reversal of 67666389 is 98366676.

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

It is not a de Polignac number, because 67666389 - 2¹ = 67666387 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67666381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1611084 + ... + 1611125.

It is an arithmetic number, because the mean of its divisors is an integer number (12888840).

Almost surely, 2^67666389 is an apocalyptic number.

It is an amenable number.

67666389 is a deficient number, since it is larger than the sum of its proper divisors (35444331).

67666389 is a wasteful number, since it uses less digits than its factorization.

67666389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222219.

The product of its digits is 1959552, while the sum is 51.

The square root of 67666389 is about 8225.9582420530. The cubic root of 67666389 is about 407.4969229572.

The spelling of 67666389 in words is "sixty-seven million, six hundred sixty-six thousand, three hundred eighty-nine".