66725688 has 32 divisors (see below), whose sum is σ = 167020560. Its totient is φ = 22214400.

The previous prime is 66725677. The next prime is 66725707. The reversal of 66725688 is 88652766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30156 + ... + 32292.

Almost surely, 2^66725688 is an apocalyptic number.

It is an amenable number.

66725688 is an abundant number, since it is smaller than the sum of its proper divisors (100294872).

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

66725688 is a wasteful number, since it uses less digits than its factorization.

66725688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447 (or 3443 counting only the distinct ones).

The product of its digits is 967680, while the sum is 48.

The square root of 66725688 is about 8168.5793134425. The cubic root of 66725688 is about 405.5997576336.

The spelling of 66725688 in words is "sixty-six million, seven hundred twenty-five thousand, six hundred eighty-eight".