660632728 has 16 divisors (see below), whose sum is σ = 1415641680. Its totient is φ = 283128288.

The previous prime is 660632719. The next prime is 660632747. The reversal of 660632728 is 827236066.

It is a congruent number.

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, 5898451 + ... + 5898562.

It is an arithmetic number, because the mean of its divisors is an integer number (88477605).

Almost surely, 2^660632728 is an apocalyptic number.

It is an amenable number.

660632728 is an abundant number, since it is smaller than the sum of its proper divisors (755008952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660632728 is a wasteful number, since it uses less digits than its factorization.

660632728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11797026 (or 11797022 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 660632728 is about 25702.7766593417. The cubic root of 660632728 is about 870.9369076189.

The spelling of 660632728 in words is "six hundred sixty million, six hundred thirty-two thousand, seven hundred twenty-eight".