680447393 has 2 divisors, whose sum is σ = 680447394. Its totient is φ = 680447392.

The previous prime is 680447371. The next prime is 680447407. The reversal of 680447393 is 393744086.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611424529 + 69022864 = 24727^2 + 8308^2 .

It is a cyclic number.

It is not a de Polignac number, because 680447393 - 2⁸ = 680447137 is a prime.

It is not a weakly prime, because it can be changed into another prime (680440393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340223696 + 340223697.

It is an arithmetic number, because the mean of its divisors is an integer number (340223697).

Almost surely, 2^680447393 is an apocalyptic number.

It is an amenable number.

680447393 is a deficient number, since it is larger than the sum of its proper divisors (1).

680447393 is an equidigital number, since it uses as much as digits as its factorization.

680447393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 680447393 is about 26085.3865794625. The cubic root of 680447393 is about 879.5587461539.

The spelling of 680447393 in words is "six hundred eighty million, four hundred forty-seven thousand, three hundred ninety-three".