66408412 has 12 divisors (see below), whose sum is σ = 132816880. Its totient is φ = 28460736.

The previous prime is 66408403. The next prime is 66408413. The reversal of 66408412 is 21480466.

66408412 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66408413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185837 + ... + 1185892.

Almost surely, 2^66408412 is an apocalyptic number.

It is an amenable number.

66408412 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66408412 is a wasteful number, since it uses less digits than its factorization.

66408412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371740 (or 2371738 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 66408412 is about 8149.1356596881. The cubic root of 66408412 is about 404.9558698042.

Adding to 66408412 its reverse (21480466), we get a palindrome (87888878).

The spelling of 66408412 in words is "sixty-six million, four hundred eight thousand, four hundred twelve".