68281731 has 16 divisors (see below), whose sum is σ = 115609600. Its totient is φ = 39018024.

The previous prime is 68281723. The next prime is 68281751. The reversal of 68281731 is 13718286.

It is not a de Polignac number, because 68281731 - 2³ = 68281723 is a prime.

It is a super-2 number, since 2×68281731² = 9324789576712722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68281751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180451 + ... + 180828.

It is an arithmetic number, because the mean of its divisors is an integer number (7225600).

Almost surely, 2^68281731 is an apocalyptic number.

68281731 is a deficient number, since it is larger than the sum of its proper divisors (47327869).

68281731 is a wasteful number, since it uses less digits than its factorization.

68281731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361295 (or 361289 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 68281731 is about 8263.2760452498. The cubic root of 68281731 is about 408.7284240779.

The spelling of 68281731 in words is "sixty-eight million, two hundred eighty-one thousand, seven hundred thirty-one".