66280412 has 18 divisors (see below), whose sum is σ = 127494864. Its totient is φ = 30127240.

The previous prime is 66280381. The next prime is 66280421. The reversal of 66280412 is 21408266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67988 + ... + 68955.

It is an arithmetic number, because the mean of its divisors is an integer number (7083048).

Almost surely, 2^66280412 is an apocalyptic number.

It is an amenable number.

66280412 is a deficient number, since it is larger than the sum of its proper divisors (61214452).

66280412 is a wasteful number, since it uses less digits than its factorization.

66280412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136969 (or 136956 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 66280412 is about 8141.2782780102. The cubic root of 66280412 is about 404.6955228167.

Adding to 66280412 its reverse (21408266), we get a palindrome (87688678).

The spelling of 66280412 in words is "sixty-six million, two hundred eighty thousand, four hundred twelve".