680908664 has 8 divisors (see below), whose sum is σ = 1276703760. Its totient is φ = 340454328.

The previous prime is 680908637. The next prime is 680908691. The reversal of 680908664 is 466809086.

It is an interprime number because it is at equal distance from previous prime (680908637) and next prime (680908691).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42556784 + ... + 42556799.

It is an arithmetic number, because the mean of its divisors is an integer number (159587970).

Almost surely, 2^680908664 is an apocalyptic number.

It is an amenable number.

680908664 is a deficient number, since it is larger than the sum of its proper divisors (595795096).

680908664 is a wasteful number, since it uses less digits than its factorization.

680908664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85113589 (or 85113585 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 680908664 is about 26094.2266411557. The cubic root of 680908664 is about 879.7574503711.

The spelling of 680908664 in words is "six hundred eighty million, nine hundred eight thousand, six hundred sixty-four".