680796621 has 6 divisors (see below), whose sum is σ = 983372910. Its totient is φ = 453864408.

The previous prime is 680796617. The next prime is 680796629. The reversal of 680796621 is 126697086.

It can be written as a sum of positive squares in only one way, i.e., 532224900 + 148571721 = 23070^2 + 12189^2 .

It is not a de Polignac number, because 680796621 - 2² = 680796617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680796629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37822026 + ... + 37822043.

It is an arithmetic number, because the mean of its divisors is an integer number (163895485).

Almost surely, 2^680796621 is an apocalyptic number.

It is an amenable number.

680796621 is a deficient number, since it is larger than the sum of its proper divisors (302576289).

680796621 is a wasteful number, since it uses less digits than its factorization.

680796621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75644075 (or 75644072 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 680796621 is about 26092.0796603107. The cubic root of 680796621 is about 879.7091932522.

The spelling of 680796621 in words is "six hundred eighty million, seven hundred ninety-six thousand, six hundred twenty-one".