66687412 has 12 divisors (see below), whose sum is σ = 127312416. Its totient is φ = 30312440.

The previous prime is 66687349. The next prime is 66687421. The reversal of 66687412 is 21478666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757768 + ... + 757855.

It is an arithmetic number, because the mean of its divisors is an integer number (10609368).

Almost surely, 2^66687412 is an apocalyptic number.

It is an amenable number.

66687412 is a deficient number, since it is larger than the sum of its proper divisors (60625004).

66687412 is a wasteful number, since it uses less digits than its factorization.

66687412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515638 (or 1515636 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 66687412 is about 8166.2360974931. The cubic root of 66687412 is about 405.5221877789.

The spelling of 66687412 in words is "sixty-six million, six hundred eighty-seven thousand, four hundred twelve".