68708681 has 4 divisors (see below), whose sum is σ = 68885700. Its totient is φ = 68531664.

The previous prime is 68708663. The next prime is 68708683. The reversal of 68708681 is 18680786.

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 29333056 + 39375625 = 5416^2 + 6275^2 .

It is a cyclic number.

It is not a de Polignac number, because 68708681 - 2¹⁰ = 68707657 is a prime.

It is a super-2 number, since 2×68708681² = 9441765689519522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68708683) 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, 87926 + ... + 88703.

It is an arithmetic number, because the mean of its divisors is an integer number (17221425).

Almost surely, 2^68708681 is an apocalyptic number.

It is an amenable number.

68708681 is a deficient number, since it is larger than the sum of its proper divisors (177019).

68708681 is a wasteful number, since it uses less digits than its factorization.

68708681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177018.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 68708681 is about 8289.0699719570. The cubic root of 68708681 is about 409.5785496764.

It can be divided in two parts, 6870 and 8681, that added together give a palindrome (15551).

The spelling of 68708681 in words is "sixty-eight million, seven hundred eight thousand, six hundred eighty-one".