66316840 has 64 divisors (see below), whose sum is σ = 159408000. Its totient is φ = 24756480.

The previous prime is 66316829. The next prime is 66316841. The reversal of 66316840 is 4861366.

It is a junction number, because it is equal to n+sod(n) for n = 66316796 and 66316805.

It is not an unprimeable number, because it can be changed into a prime (66316841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53346 + ... + 54574.

It is an arithmetic number, because the mean of its divisors is an integer number (2490750).

Almost surely, 2^66316840 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 66316840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79704000).

66316840 is an abundant number, since it is smaller than the sum of its proper divisors (93091160).

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

66316840 is a wasteful number, since it uses less digits than its factorization.

66316840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1326 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 66316840 is about 8143.5152115042. The cubic root of 66316840 is about 404.7696500391.

The spelling of 66316840 in words is "sixty-six million, three hundred sixteen thousand, eight hundred forty".