68281836 has 72 divisors (see below), whose sum is σ = 186391296. Its totient is φ = 19054560.

The previous prime is 68281831. The next prime is 68281847. The reversal of 68281836 is 63818286.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (68281831) 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 23 ways as a sum of consecutive naturals, for example, 638095 + ... + 638201.

It is an arithmetic number, because the mean of its divisors is an integer number (2588768).

Almost surely, 2^68281836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68281836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93195648).

68281836 is an abundant number, since it is smaller than the sum of its proper divisors (118109460).

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

68281836 is a wasteful number, since it uses less digits than its factorization.

68281836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 190 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 68281836 is about 8263.2823986597. The cubic root of 68281836 is about 408.7286335847.

The spelling of 68281836 in words is "sixty-eight million, two hundred eighty-one thousand, eight hundred thirty-six".