68781330 has 144 divisors (see below), whose sum is σ = 197921880. Its totient is φ = 16547328.

The previous prime is 68781283. The next prime is 68781331. The reversal of 68781330 is 3318786.

It can be written as a sum of positive squares in 4 ways, for example, as 57471561 + 11309769 = 7581^2 + 3363^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68781331) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 942174 + ... + 942246.

Almost surely, 2^68781330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68781330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98960940).

68781330 is an abundant number, since it is smaller than the sum of its proper divisors (129140550).

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

68781330 is a wasteful number, since it uses less digits than its factorization.

68781330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 68781330 is about 8293.4510307833. The cubic root of 68781330 is about 409.7228545419.

The spelling of 68781330 in words is "sixty-eight million, seven hundred eighty-one thousand, three hundred thirty".