67969681 has 4 divisors (see below), whose sum is σ = 73198132. Its totient is φ = 62741232.

The previous prime is 67969679. The next prime is 67969687. The reversal of 67969681 is 18696976.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41796225 + 26173456 = 6465^2 + 5116^2 .

It is a cyclic number.

It is not a de Polignac number, because 67969681 - 2¹ = 67969679 is a prime.

It is a super-2 number, since 2×67969681² = 9239755070483522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67969687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2614206 + ... + 2614231.

It is an arithmetic number, because the mean of its divisors is an integer number (18299533).

Almost surely, 2^67969681 is an apocalyptic number.

It is an amenable number.

67969681 is a deficient number, since it is larger than the sum of its proper divisors (5228451).

67969681 is a wasteful number, since it uses less digits than its factorization.

67969681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5228450.

The product of its digits is 979776, while the sum is 52.

The square root of 67969681 is about 8244.3726868695. The cubic root of 67969681 is about 408.1048385751.

The spelling of 67969681 in words is "sixty-seven million, nine hundred sixty-nine thousand, six hundred eighty-one".