66783984 has 40 divisors (see below), whose sum is σ = 178478160. Its totient is φ = 21493248.

The previous prime is 66783979. The next prime is 66783989. The reversal of 66783984 is 48938766.

It is an interprime number because it is at equal distance from previous prime (66783979) and next prime (66783989).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66783989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22597 + ... + 25380.

It is an arithmetic number, because the mean of its divisors is an integer number (4461954).

Almost surely, 2^66783984 is an apocalyptic number.

It is an amenable number.

66783984 is an abundant number, since it is smaller than the sum of its proper divisors (111694176).

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

66783984 is a wasteful number, since it uses less digits than its factorization.

66783984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48017 (or 48011 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 66783984 is about 8172.1468415588. The cubic root of 66783984 is about 405.7178428949.

The spelling of 66783984 in words is "sixty-six million, seven hundred eighty-three thousand, nine hundred eighty-four".