68354781 has 16 divisors (see below), whose sum is σ = 103749120. Its totient is φ = 39625520.

The previous prime is 68354777. The next prime is 68354801. The reversal of 68354781 is 18745386.

It is not a de Polignac number, because 68354781 - 2² = 68354777 is a prime.

It is a super-2 number, since 2×68354781² = 9344752171115922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68354731) 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, 44271 + ... + 45788.

It is an arithmetic number, because the mean of its divisors is an integer number (6484320).

Almost surely, 2^68354781 is an apocalyptic number.

It is an amenable number.

68354781 is a deficient number, since it is larger than the sum of its proper divisors (35394339).

68354781 is a wasteful number, since it uses less digits than its factorization.

68354781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90096.

The product of its digits is 161280, while the sum is 42.

The square root of 68354781 is about 8267.6950234028. The cubic root of 68354781 is about 408.8741290843.

The spelling of 68354781 in words is "sixty-eight million, three hundred fifty-four thousand, seven hundred eighty-one".