66863824 has 30 divisors (see below), whose sum is σ = 131557490. Its totient is φ = 32921280.

The previous prime is 66863803. The next prime is 66863827. The reversal of 66863824 is 42836866.

66863824 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 58798224 + 8065600 = 7668^2 + 2840^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66863827) 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 5 ways as a sum of consecutive naturals, for example, 80242 + ... + 81070.

Almost surely, 2^66863824 is an apocalyptic number.

It is an amenable number.

66863824 is a deficient number, since it is larger than the sum of its proper divisors (64693666).

66863824 is an equidigital number, since it uses as much as digits as its factorization.

66863824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979 (or 902 counting only the distinct ones).

The product of its digits is 331776, while the sum is 43.

The square root of 66863824 is about 8177.0302677684. The cubic root of 66863824 is about 405.8794565575.

The spelling of 66863824 in words is "sixty-six million, eight hundred sixty-three thousand, eight hundred twenty-four".