68221816 has 64 divisors (see below), whose sum is σ = 149143680. Its totient is φ = 28968960.

The previous prime is 68221807. The next prime is 68221823. The reversal of 68221816 is 61812286.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 82686 + ... + 83506.

It is an arithmetic number, because the mean of its divisors is an integer number (2330370).

Almost surely, 2^68221816 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 68221816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74571840).

68221816 is an abundant number, since it is smaller than the sum of its proper divisors (80921864).

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

68221816 is a wasteful number, since it uses less digits than its factorization.

68221816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904 (or 900 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 68221816 is about 8259.6498715139. The cubic root of 68221816 is about 408.6088404576.

The spelling of 68221816 in words is "sixty-eight million, two hundred twenty-one thousand, eight hundred sixteen".