68859781 has 8 divisors (see below), whose sum is σ = 73057280. Its totient is φ = 64719648.

The previous prime is 68859779. The next prime is 68859803. The reversal of 68859781 is 18795886.

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 68859781 - 2¹ = 68859779 is a prime.

It is a super-2 number, since 2×68859781² = 9483338878735922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68859761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11856 + ... + 16681.

It is an arithmetic number, because the mean of its divisors is an integer number (9132160).

Almost surely, 2^68859781 is an apocalyptic number.

It is an amenable number.

68859781 is a deficient number, since it is larger than the sum of its proper divisors (4197499).

68859781 is a wasteful number, since it uses less digits than its factorization.

68859781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28683.

The product of its digits is 967680, while the sum is 52.

The square root of 68859781 is about 8298.1793786348. The cubic root of 68859781 is about 409.8785700281.

The spelling of 68859781 in words is "sixty-eight million, eight hundred fifty-nine thousand, seven hundred eighty-one".