66408012 has 72 divisors (see below), whose sum is σ = 189938112. Its totient is φ = 20120400.

The previous prime is 66407989. The next prime is 66408031. The reversal of 66408012 is 21080466.

66408012 is a `hidden beast` number, since 6 + 640 + 8 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7587 + ... + 13797.

Almost surely, 2^66408012 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 66408012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94969056).

66408012 is an abundant number, since it is smaller than the sum of its proper divisors (123530100).

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

66408012 is a wasteful number, since it uses less digits than its factorization.

66408012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6241 (or 6227 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 66408012 is about 8149.1111171710. Note that the first 5 decimals coincide. The cubic root of 66408012 is about 404.9550567412.

Adding to 66408012 its reverse (21080466), we get a palindrome (87488478).

The spelling of 66408012 in words is "sixty-six million, four hundred eight thousand, twelve".