66814912 has 28 divisors (see below), whose sum is σ = 135824976. Its totient is φ = 32591360.

The previous prime is 66814897. The next prime is 66814921. The reversal of 66814912 is 21941866.

It is a happy number.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

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, 10108 + ... + 15355.

It is an arithmetic number, because the mean of its divisors is an integer number (4850892).

Almost surely, 2^66814912 is an apocalyptic number.

It is an amenable number.

66814912 is an abundant number, since it is smaller than the sum of its proper divisors (69010064).

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

66814912 is a wasteful number, since it uses less digits than its factorization.

66814912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25516 (or 25506 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 66814912 is about 8174.0389037489. The cubic root of 66814912 is about 405.7804632228.

The spelling of 66814912 in words is "sixty-six million, eight hundred fourteen thousand, nine hundred twelve".