68644281 has 8 divisors (see below), whose sum is σ = 92469664. Its totient is φ = 45290880.

The previous prime is 68644267. The next prime is 68644307. The reversal of 68644281 is 18244686.

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

It is not a de Polignac number, because 68644281 - 2⁶ = 68644217 is a prime.

It is a super-2 number, since 2×68644281² = 9424074628013922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68644241) 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, 117655 + ... + 118236.

It is an arithmetic number, because the mean of its divisors is an integer number (11558708).

Almost surely, 2^68644281 is an apocalyptic number.

It is an amenable number.

68644281 is a deficient number, since it is larger than the sum of its proper divisors (23825383).

68644281 is a wasteful number, since it uses less digits than its factorization.

68644281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235991.

The product of its digits is 73728, while the sum is 39.

The square root of 68644281 is about 8285.1844276395. The cubic root of 68644281 is about 409.4505449690.

The spelling of 68644281 in words is "sixty-eight million, six hundred forty-four thousand, two hundred eighty-one".