66943628 has 24 divisors (see below), whose sum is σ = 120466080. Its totient is φ = 32538240.

The previous prime is 66943627. The next prime is 66943691. The reversal of 66943628 is 82634966.

It is not an unprimeable number, because it can be changed into a prime (66943621) 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 7 ways as a sum of consecutive naturals, for example, 19118 + ... + 22346.

It is an arithmetic number, because the mean of its divisors is an integer number (5019420).

Almost surely, 2^66943628 is an apocalyptic number.

It is an amenable number.

66943628 is a deficient number, since it is larger than the sum of its proper divisors (53522452).

66943628 is a wasteful number, since it uses less digits than its factorization.

66943628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377 (or 3375 counting only the distinct ones).

The product of its digits is 373248, while the sum is 44.

The square root of 66943628 is about 8181.9085792986. The cubic root of 66943628 is about 406.0408688344.

The spelling of 66943628 in words is "sixty-six million, nine hundred forty-three thousand, six hundred twenty-eight".