68285881 has 4 divisors (see below), whose sum is σ = 68306292. Its totient is φ = 68265472.

The previous prime is 68285863. The next prime is 68285891. The reversal of 68285881 is 18858286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18858286 = 2 ⋅9429143.

It can be written as a sum of positive squares in 2 ways, for example, as 64641600 + 3644281 = 8040^2 + 1909^2 .

It is a cyclic number.

It is not a de Polignac number, because 68285881 - 2⁹ = 68285369 is a prime.

It is a super-2 number, since 2×68285881² = 9325923087892322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68285801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3880 + ... + 12313.

It is an arithmetic number, because the mean of its divisors is an integer number (17076573).

Almost surely, 2^68285881 is an apocalyptic number.

It is an amenable number.

68285881 is a deficient number, since it is larger than the sum of its proper divisors (20411).

68285881 is a wasteful number, since it uses less digits than its factorization.

68285881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20410.

The product of its digits is 245760, while the sum is 46.

The square root of 68285881 is about 8263.5271524937. The cubic root of 68285881 is about 408.7367044215.

The spelling of 68285881 in words is "sixty-eight million, two hundred eighty-five thousand, eight hundred eighty-one".