68308992 has 156 divisors (see below), whose sum is σ = 210836340. Its totient is φ = 21233664.

The previous prime is 68308969. The next prime is 68309041. The reversal of 68308992 is 29980386.

It can be written as a sum of positive squares in 2 ways, for example, as 50466816 + 17842176 = 7104^2 + 4224^2 .

It is a super-2 number, since 2×68308992² = 9332236776112128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 626634 + ... + 626742.

It is an arithmetic number, because the mean of its divisors is an integer number (1351515).

Almost surely, 2^68308992 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 68308992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105418170).

68308992 is an abundant number, since it is smaller than the sum of its proper divisors (142527348).

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

68308992 is a wasteful number, since it uses less digits than its factorization.

68308992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 68308992 is about 8264.9254080119. The cubic root of 68308992 is about 408.7828108218.

The spelling of 68308992 in words is "sixty-eight million, three hundred eight thousand, nine hundred ninety-two".