67991868 has 72 divisors (see below), whose sum is σ = 199402112. Its totient is φ = 19131552.

The previous prime is 67991851. The next prime is 67991873. The reversal of 67991868 is 86819976.

It is a super-2 number, since 2×67991868² = 9245788228258848, which contains 22 as substring.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 14871 + ... + 18897.

Almost surely, 2^67991868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67991868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99701056).

67991868 is an abundant number, since it is smaller than the sum of its proper divisors (131410244).

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

67991868 is a wasteful number, since it uses less digits than its factorization.

67991868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4111 (or 4106 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 67991868 is about 8245.7181615673. The cubic root of 67991868 is about 408.1492389454.

The spelling of 67991868 in words is "sixty-seven million, nine hundred ninety-one thousand, eight hundred sixty-eight".