68730281 has 4 divisors (see below), whose sum is σ = 68997972. Its totient is φ = 68462592.

The previous prime is 68730257. The next prime is 68730283. The reversal of 68730281 is 18203786.

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 68227600 + 502681 = 8260^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 68730281 - 2¹⁰ = 68729257 is a prime.

It is a super-2 number, since 2×68730281² = 9447703052677922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68730283) 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, 133460 + ... + 133973.

It is an arithmetic number, because the mean of its divisors is an integer number (17249493).

Almost surely, 2^68730281 is an apocalyptic number.

It is an amenable number.

68730281 is a deficient number, since it is larger than the sum of its proper divisors (267691).

68730281 is a wasteful number, since it uses less digits than its factorization.

68730281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267690.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 68730281 is about 8290.3727901705. The cubic root of 68730281 is about 409.6214650190.

The spelling of 68730281 in words is "sixty-eight million, seven hundred thirty thousand, two hundred eighty-one".