68818644 has 36 divisors (see below), whose sum is σ = 174253716. Its totient is φ = 22900608.

The previous prime is 68818643. The next prime is 68818661. The reversal of 68818644 is 44681886.

It can be written as a sum of positive squares in 2 ways, for example, as 25100100 + 43718544 = 5010^2 + 6612^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 68818644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68818643) 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 11 ways as a sum of consecutive naturals, for example, 26592 + ... + 29064.

It is an arithmetic number, because the mean of its divisors is an integer number (4840381).

Almost surely, 2^68818644 is an apocalyptic number.

It is an amenable number.

68818644 is an abundant number, since it is smaller than the sum of its proper divisors (105435072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68818644 is a wasteful number, since it uses less digits than its factorization.

68818644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3256 (or 3251 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 68818644 is about 8295.7003320998. The cubic root of 68818644 is about 409.7969329522.

The spelling of 68818644 in words is "sixty-eight million, eight hundred eighteen thousand, six hundred forty-four".