68144681 has 4 divisors (see below), whose sum is σ = 74339664. Its totient is φ = 61949700.

The previous prime is 68144677. The next prime is 68144683. The reversal of 68144681 is 18644186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68144681 - 2² = 68144677 is a prime.

It is a super-2 number, since 2×68144681² = 9287395097183522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68144683) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3097475 + ... + 3097496.

It is an arithmetic number, because the mean of its divisors is an integer number (18584916).

Almost surely, 2^68144681 is an apocalyptic number.

It is an amenable number.

68144681 is a deficient number, since it is larger than the sum of its proper divisors (6194983).

68144681 is a wasteful number, since it uses less digits than its factorization.

68144681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6194982.

The product of its digits is 36864, while the sum is 38.

The square root of 68144681 is about 8254.9791641166. The cubic root of 68144681 is about 408.4547845126.

The spelling of 68144681 in words is "sixty-eight million, one hundred forty-four thousand, six hundred eighty-one".