67989636 has 144 divisors (see below), whose sum is σ = 206938368. Its totient is φ = 18547200.

The previous prime is 67989631. The next prime is 67989637. The reversal of 67989636 is 63698976.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67989631) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 241816 + ... + 242096.

It is an arithmetic number, because the mean of its divisors is an integer number (1437072).

Almost surely, 2^67989636 is an apocalyptic number.

67989636 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67989636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103469184).

67989636 is an abundant number, since it is smaller than the sum of its proper divisors (138948732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67989636 is a wasteful number, since it uses less digits than its factorization.

67989636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 357 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 67989636 is about 8245.5828174848. The cubic root of 67989636 is about 408.1447727296.

The spelling of 67989636 in words is "sixty-seven million, nine hundred eighty-nine thousand, six hundred thirty-six".