68585781 has 8 divisors (see below), whose sum is σ = 99761184. Its totient is φ = 41567120.

The previous prime is 68585779. The next prime is 68585791. The reversal of 68585781 is 18758586.

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

It is a cyclic number.

It is not a de Polignac number, because 68585781 - 2¹ = 68585779 is a prime.

It is a super-2 number, since 2×68585781² = 9408018710759922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68585781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68585711) 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 7 ways as a sum of consecutive naturals, for example, 1039146 + ... + 1039211.

It is an arithmetic number, because the mean of its divisors is an integer number (12470148).

Almost surely, 2^68585781 is an apocalyptic number.

It is an amenable number.

68585781 is a deficient number, since it is larger than the sum of its proper divisors (31175403).

68585781 is a wasteful number, since it uses less digits than its factorization.

68585781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078371.

The product of its digits is 537600, while the sum is 48.

The square root of 68585781 is about 8281.6532769731. The cubic root of 68585781 is about 409.3341979885.

The spelling of 68585781 in words is "sixty-eight million, five hundred eighty-five thousand, seven hundred eighty-one".