67839681 has 32 divisors (see below), whose sum is σ = 113935360. Its totient is φ = 34945344.

The previous prime is 67839677. The next prime is 67839683. The reversal of 67839681 is 18693876.

It is not a de Polignac number, because 67839681 - 2² = 67839677 is a prime.

It is a super-2 number, since 2×67839681² = 9204444636363522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 67839681.

It is not an unprimeable number, because it can be changed into a prime (67839683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8850 + ... + 14628.

It is an arithmetic number, because the mean of its divisors is an integer number (3560480).

Almost surely, 2^67839681 is an apocalyptic number.

It is an amenable number.

67839681 is a deficient number, since it is larger than the sum of its proper divisors (46095679).

67839681 is a wasteful number, since it uses less digits than its factorization.

67839681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5845.

The product of its digits is 435456, while the sum is 48.

The square root of 67839681 is about 8236.4847477550. The cubic root of 67839681 is about 407.8444897059.

The spelling of 67839681 in words is "sixty-seven million, eight hundred thirty-nine thousand, six hundred eighty-one".