660630728 has 16 divisors (see below), whose sum is σ = 1255651980. Its totient is φ = 325790208.

The previous prime is 660630709. The next prime is 660630757. The reversal of 660630728 is 827036066.

It can be written as a sum of positive squares in 2 ways, for example, as 655257604 + 5373124 = 25598^2 + 2318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 660630691 and 660630700.

It is an unprimeable number.

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, 565025 + ... + 566192.

Almost surely, 2^660630728 is an apocalyptic number.

It is an amenable number.

660630728 is a deficient number, since it is larger than the sum of its proper divisors (595021252).

660630728 is a wasteful number, since it uses less digits than its factorization.

660630728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131296 (or 1131292 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 660630728 is about 25702.7377530099. The cubic root of 660630728 is about 870.9360287264.

The spelling of 660630728 in words is "six hundred sixty million, six hundred thirty thousand, seven hundred twenty-eight".