68002681 has 4 divisors (see below), whose sum is σ = 68294772. Its totient is φ = 67710592.

The previous prime is 68002661. The next prime is 68002687. The reversal of 68002681 is 18620086.

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 9709456 + 58293225 = 3116^2 + 7635^2 .

It is a cyclic number.

It is not a de Polignac number, because 68002681 - 2⁹ = 68002169 is a prime.

It is a super-2 number, since 2×68002681² = 9248729246375522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68002687) 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, 145696 + ... + 146161.

It is an arithmetic number, because the mean of its divisors is an integer number (17073693).

Almost surely, 2^68002681 is an apocalyptic number.

It is an amenable number.

68002681 is a deficient number, since it is larger than the sum of its proper divisors (292091).

68002681 is a wasteful number, since it uses less digits than its factorization.

68002681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292090.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 68002681 is about 8246.3738091357. The cubic root of 68002681 is about 408.1708742964.

The spelling of 68002681 in words is "sixty-eight million, two thousand, six hundred eighty-one".