66199928 has 16 divisors (see below), whose sum is σ = 124821000. Its totient is φ = 32914336.

The previous prime is 66199927. The next prime is 66199949. The reversal of 66199928 is 82999166.

66199928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66199927) 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, 21683 + ... + 24546.

Almost surely, 2^66199928 is an apocalyptic number.

It is an amenable number.

66199928 is a deficient number, since it is larger than the sum of its proper divisors (58621072).

66199928 is a wasteful number, since it uses less digits than its factorization.

66199928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46414 (or 46410 counting only the distinct ones).

The product of its digits is 419904, while the sum is 50.

The square root of 66199928 is about 8136.3338181272. Note that the first 3 decimals coincide. The cubic root of 66199928 is about 404.5316498302.

The spelling of 66199928 in words is "sixty-six million, one hundred ninety-nine thousand, nine hundred twenty-eight".