666600028 has 24 divisors (see below), whose sum is σ = 1233388800. Its totient is φ = 314358768.

The previous prime is 666599977. The next prime is 666600059. The reversal of 666600028 is 820006666.

It is a junction number, because it is equal to n+sod(n) for n = 666599966 and 666600002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2068 + ... + 36571.

It is an arithmetic number, because the mean of its divisors is an integer number (51391200).

Almost surely, 2^666600028 is an apocalyptic number.

It is an amenable number.

666600028 is a deficient number, since it is larger than the sum of its proper divisors (566788772).

666600028 is a wasteful number, since it uses less digits than its factorization.

666600028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38889 (or 38887 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 666600028 is about 25818.5984902357. The cubic root of 666600028 is about 873.5513566477.

The spelling of 666600028 in words is "six hundred sixty-six million, six hundred thousand, twenty-eight".