68538281 has 8 divisors (see below), whose sum is σ = 81030720. Its totient is φ = 56721168.

The previous prime is 68538257. The next prime is 68538287. The reversal of 68538281 is 18283586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68538281 - 2¹⁴ = 68521897 is a prime.

It is a super-2 number, since 2×68538281² = 9394991924869922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68538287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168611 + ... + 169016.

It is an arithmetic number, because the mean of its divisors is an integer number (10128840).

Almost surely, 2^68538281 is an apocalyptic number.

It is an amenable number.

68538281 is a deficient number, since it is larger than the sum of its proper divisors (12492439).

68538281 is a wasteful number, since it uses less digits than its factorization.

68538281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337663.

The product of its digits is 92160, while the sum is 41.

The square root of 68538281 is about 8278.7849953964. The cubic root of 68538281 is about 409.2396795405.

The spelling of 68538281 in words is "sixty-eight million, five hundred thirty-eight thousand, two hundred eighty-one".