66884783 has 16 divisors (see below), whose sum is σ = 81204480. Its totient is φ = 53778816.

The previous prime is 66884773. The next prime is 66884809. The reversal of 66884783 is 38748866.

It is a happy number.

It is not a de Polignac number, because 66884783 - 2⁴ = 66884767 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66884743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44360 + ... + 45842.

It is an arithmetic number, because the mean of its divisors is an integer number (5075280).

Almost surely, 2^66884783 is an apocalyptic number.

66884783 is a deficient number, since it is larger than the sum of its proper divisors (14319697).

66884783 is a wasteful number, since it uses less digits than its factorization.

66884783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886.

The product of its digits is 1548288, while the sum is 50.

The square root of 66884783 is about 8178.3117450975. The cubic root of 66884783 is about 405.9218608469.

The spelling of 66884783 in words is "sixty-six million, eight hundred eighty-four thousand, seven hundred eighty-three".