1680608728 has 8 divisors (see below), whose sum is σ = 3151141380. Its totient is φ = 840304360.

The previous prime is 1680608719. The next prime is 1680608731. The reversal of 1680608728 is 8278060861.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-5 number, since 5×1680608728⁵ (a number of 47 digits) contains 55555 as substring.

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 as a sum of consecutive naturals, namely, 105038038 + ... + 105038053.

Almost surely, 2^1680608728 is an apocalyptic number.

It is an amenable number.

1680608728 is a deficient number, since it is larger than the sum of its proper divisors (1470532652).

1680608728 is a wasteful number, since it uses less digits than its factorization.

1680608728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210076097 (or 210076093 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 1680608728 is about 40995.2281125499. The cubic root of 1680608728 is about 1188.9279538384.

The spelling of 1680608728 in words is "one billion, six hundred eighty million, six hundred eight thousand, seven hundred twenty-eight".