680396648 has 8 divisors (see below), whose sum is σ = 1275743730. Its totient is φ = 340198320.

The previous prime is 680396641. The next prime is 680396657. The reversal of 680396648 is 846693086.

It can be written as a sum of positive squares in only one way, i.e., 672987364 + 7409284 = 25942^2 + 2722^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 680396596 and 680396605.

It is not an unprimeable number, because it can be changed into a prime (680396641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42524783 + ... + 42524798.

Almost surely, 2^680396648 is an apocalyptic number.

It is an amenable number.

680396648 is a deficient number, since it is larger than the sum of its proper divisors (595347082).

680396648 is a wasteful number, since it uses less digits than its factorization.

680396648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85049587 (or 85049583 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 50.

The square root of 680396648 is about 26084.4138902909. The cubic root of 680396648 is about 879.5368809720.

The spelling of 680396648 in words is "six hundred eighty million, three hundred ninety-six thousand, six hundred forty-eight".