68422781 has 16 divisors (see below), whose sum is σ = 82882560. Its totient is φ = 55177200.

The previous prime is 68422777. The next prime is 68422801. The reversal of 68422781 is 18722486.

It is a cyclic number.

It is not a de Polignac number, because 68422781 - 2² = 68422777 is a prime.

It is a super-2 number, since 2×68422781² = 9363353919547922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

Its product of digits (43008) is a multiple of the sum of its prime divisors (3584).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68422751) 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 15 ways as a sum of consecutive naturals, for example, 18380 + ... + 21786.

It is an arithmetic number, because the mean of its divisors is an integer number (5180160).

Almost surely, 2^68422781 is an apocalyptic number.

It is an amenable number.

68422781 is a deficient number, since it is larger than the sum of its proper divisors (14459779).

68422781 is a wasteful number, since it uses less digits than its factorization.

68422781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584.

The product of its digits is 43008, while the sum is 38.

The square root of 68422781 is about 8271.8063928020. The cubic root of 68422781 is about 409.0096681339.

The spelling of 68422781 in words is "sixty-eight million, four hundred twenty-two thousand, seven hundred eighty-one".