66068840 has 64 divisors (see below), whose sum is σ = 153653760. Its totient is φ = 25553920.

The previous prime is 66068839. The next prime is 66068881. The reversal of 66068840 is 4886066.

It is a junction number, because it is equal to n+sod(n) for n = 66068794 and 66068803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212285 + ... + 212595.

It is an arithmetic number, because the mean of its divisors is an integer number (2400840).

Almost surely, 2^66068840 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 66068840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76826880).

66068840 is an abundant number, since it is smaller than the sum of its proper divisors (87584920).

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

66068840 is a wasteful number, since it uses less digits than its factorization.

66068840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 66068840 is about 8128.2741095512. The cubic root of 66068840 is about 404.2644577671.

The spelling of 66068840 in words is "sixty-six million, sixty-eight thousand, eight hundred forty".