67991384 has 16 divisors (see below), whose sum is σ = 127629000. Its totient is φ = 33956992.

The previous prime is 67991333. The next prime is 67991389. The reversal of 67991384 is 48319976.

It is a super-3 number, since 3×67991384³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67991389) 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, 3467 + ... + 12165.

Almost surely, 2^67991384 is an apocalyptic number.

It is an amenable number.

67991384 is a deficient number, since it is larger than the sum of its proper divisors (59637616).

67991384 is a wasteful number, since it uses less digits than its factorization.

67991384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9682 (or 9678 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 67991384 is about 8245.6888129495. The cubic root of 67991384 is about 408.1482704732.

The spelling of 67991384 in words is "sixty-seven million, nine hundred ninety-one thousand, three hundred eighty-four".