66766448 has 40 divisors (see below), whose sum is σ = 148820832. Its totient is φ = 28424448.

The previous prime is 66766421. The next prime is 66766451. The reversal of 66766448 is 84466766.

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, 15686 + ... + 19482.

Almost surely, 2^66766448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66766448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74410416).

66766448 is an abundant number, since it is smaller than the sum of its proper divisors (82054384).

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

66766448 is a wasteful number, since it uses less digits than its factorization.

66766448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969 (or 3963 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 47.

The square root of 66766448 is about 8171.0738584350. The cubic root of 66766448 is about 405.6823289364.

The spelling of 66766448 in words is "sixty-six million, seven hundred sixty-six thousand, four hundred forty-eight".