68441881 has 4 divisors (see below), whose sum is σ = 72467892. Its totient is φ = 64415872.

The previous prime is 68441873. The next prime is 68441899. The reversal of 68441881 is 18814486.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18814486 = 2 ⋅9407243.

It can be written as a sum of positive squares in 2 ways, for example, as 34987225 + 33454656 = 5915^2 + 5784^2 .

It is a cyclic number.

It is not a de Polignac number, because 68441881 - 2³ = 68441873 is a prime.

It is a super-2 number, since 2×68441881² = 9368582149636322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68441851) 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 3 ways as a sum of consecutive naturals, for example, 2012980 + ... + 2013013.

It is an arithmetic number, because the mean of its divisors is an integer number (18116973).

Almost surely, 2^68441881 is an apocalyptic number.

It is an amenable number.

68441881 is a deficient number, since it is larger than the sum of its proper divisors (4026011).

68441881 is a wasteful number, since it uses less digits than its factorization.

68441881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026010.

The product of its digits is 49152, while the sum is 40.

The square root of 68441881 is about 8272.9608363632. The cubic root of 68441881 is about 409.0477225058.

The spelling of 68441881 in words is "sixty-eight million, four hundred forty-one thousand, eight hundred eighty-one".