68181320 has 64 divisors (see below), whose sum is σ = 161838000. Its totient is φ = 25811968.

The previous prime is 68181317. The next prime is 68181331. The reversal of 68181320 is 2318186.

It can be written as a sum of positive squares in 8 ways, for example, as 16370116 + 51811204 = 4046^2 + 7198^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60926 + ... + 62034.

Almost surely, 2^68181320 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 68181320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80919000).

68181320 is an abundant number, since it is smaller than the sum of its proper divisors (93656680).

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

68181320 is a wasteful number, since it uses less digits than its factorization.

68181320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 1198 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 68181320 is about 8257.1980719854. The cubic root of 68181320 is about 408.5279753242.

The spelling of 68181320 in words is "sixty-eight million, one hundred eighty-one thousand, three hundred twenty".