680446388 has 6 divisors (see below), whose sum is σ = 1190781186. Its totient is φ = 340223192.

The previous prime is 680446381. The next prime is 680446423. The reversal of 680446388 is 883644086.

It can be written as a sum of positive squares in only one way, i.e., 586511524 + 93934864 = 24218^2 + 9692^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680446381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85055795 + ... + 85055802.

It is an arithmetic number, because the mean of its divisors is an integer number (198463531).

Almost surely, 2^680446388 is an apocalyptic number.

It is an amenable number.

680446388 is a deficient number, since it is larger than the sum of its proper divisors (510334798).

680446388 is a wasteful number, since it uses less digits than its factorization.

680446388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170111601 (or 170111599 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 47.

The square root of 680446388 is about 26085.3673157960. The cubic root of 680446388 is about 879.5583131266.

The spelling of 680446388 in words is "six hundred eighty million, four hundred forty-six thousand, three hundred eighty-eight".