680604021 has 12 divisors (see below), whose sum is σ = 984823840. Its totient is φ = 452937960.

The previous prime is 680604019. The next prime is 680604053. The reversal of 680604021 is 120406086.

It is not a de Polignac number, because 680604021 - 2¹ = 680604019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680604091) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 61081 + ... + 71358.

Almost surely, 2^680604021 is an apocalyptic number.

It is an amenable number.

680604021 is a deficient number, since it is larger than the sum of its proper divisors (304219819).

680604021 is a wasteful number, since it uses less digits than its factorization.

680604021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133016 (or 133013 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 680604021 is about 26088.3886240603. The cubic root of 680604021 is about 879.6262277157.

The spelling of 680604021 in words is "six hundred eighty million, six hundred four thousand, twenty-one".