67686981 has 8 divisors (see below), whose sum is σ = 93160704. Its totient is φ = 43668960.

The previous prime is 67686961. The next prime is 67686991. The reversal of 67686981 is 18968676.

It is a happy number.

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

It is not a de Polignac number, because 67686981 - 2⁶ = 67686917 is a prime.

It is a super-2 number, since 2×67686981² = 9163054793788722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67686961) 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, 363816 + ... + 364001.

It is an arithmetic number, because the mean of its divisors is an integer number (11645088).

Almost surely, 2^67686981 is an apocalyptic number.

It is an amenable number.

67686981 is a deficient number, since it is larger than the sum of its proper divisors (25473723).

67686981 is a wasteful number, since it uses less digits than its factorization.

67686981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727851.

The product of its digits is 870912, while the sum is 51.

The square root of 67686981 is about 8227.2097943349. The cubic root of 67686981 is about 407.5382547799.

The spelling of 67686981 in words is "sixty-seven million, six hundred eighty-six thousand, nine hundred eighty-one".