66783764 has 12 divisors (see below), whose sum is σ = 116949504. Its totient is φ = 33369624.

The previous prime is 66783749. The next prime is 66783767. The reversal of 66783764 is 46738766.

66783764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66783764² = 8920142268015392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66783767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2477 + ... + 11819.

It is an arithmetic number, because the mean of its divisors is an integer number (9745792).

Almost surely, 2^66783764 is an apocalyptic number.

It is an amenable number.

66783764 is a deficient number, since it is larger than the sum of its proper divisors (50165740).

66783764 is a wasteful number, since it uses less digits than its factorization.

66783764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11134 (or 11132 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 47.

The square root of 66783764 is about 8172.1333811925. The cubic root of 66783764 is about 405.7173973888.

The spelling of 66783764 in words is "sixty-six million, seven hundred eighty-three thousand, seven hundred sixty-four".