68785681 has 16 divisors (see below), whose sum is σ = 75398400. Its totient is φ = 62527248.

The previous prime is 68785657. The next prime is 68785687. The reversal of 68785681 is 18658786.

It is a cyclic number.

It is not a de Polignac number, because 68785681 - 2¹¹ = 68783633 is a prime.

It is a super-2 number, since 2×68785681² = 9462939821267522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68785687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47490 + ... + 48916.

It is an arithmetic number, because the mean of its divisors is an integer number (4712400).

Almost surely, 2^68785681 is an apocalyptic number.

It is an amenable number.

68785681 is a deficient number, since it is larger than the sum of its proper divisors (6612719).

68785681 is a wasteful number, since it uses less digits than its factorization.

68785681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548.

The product of its digits is 645120, while the sum is 49.

The square root of 68785681 is about 8293.7133420441. The cubic root of 68785681 is about 409.7314938366.

It can be divided in two parts, 687 and 85681, that added together give a palindrome (86368).

The spelling of 68785681 in words is "sixty-eight million, seven hundred eighty-five thousand, six hundred eighty-one".