66447782 has 16 divisors (see below), whose sum is σ = 106818912. Its totient is φ = 30919680.

The previous prime is 66447779. The next prime is 66447791. The reversal of 66447782 is 28774466.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17819 + ... + 21222.

It is an arithmetic number, because the mean of its divisors is an integer number (6676182).

Almost surely, 2^66447782 is an apocalyptic number.

66447782 is a deficient number, since it is larger than the sum of its proper divisors (40371130).

66447782 is a wasteful number, since it uses less digits than its factorization.

66447782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39103.

The product of its digits is 451584, while the sum is 44.

The square root of 66447782 is about 8151.5508953818. The cubic root of 66447782 is about 405.0358795627.

The spelling of 66447782 in words is "sixty-six million, four hundred forty-seven thousand, seven hundred eighty-two".