68983681 has 4 divisors (see below), whose sum is σ = 74290132. Its totient is φ = 63677232.

The previous prime is 68983679. The next prime is 68983697. The reversal of 68983681 is 18638986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18638986 = 2 ⋅9319493.

It can be written as a sum of positive squares in 2 ways, for example, as 36493681 + 32490000 = 6041^2 + 5700^2 .

It is a cyclic number.

It is not a de Polignac number, because 68983681 - 2¹ = 68983679 is a prime.

It is a super-2 number, since 2×68983681² = 9517496488619522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68981681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2653206 + ... + 2653231.

It is an arithmetic number, because the mean of its divisors is an integer number (18572533).

Almost surely, 2^68983681 is an apocalyptic number.

It is an amenable number.

68983681 is a deficient number, since it is larger than the sum of its proper divisors (5306451).

68983681 is a wasteful number, since it uses less digits than its factorization.

68983681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306450.

The product of its digits is 497664, while the sum is 49.

The square root of 68983681 is about 8305.6415164634. The cubic root of 68983681 is about 410.1242554186.

The spelling of 68983681 in words is "sixty-eight million, nine hundred eighty-three thousand, six hundred eighty-one".