680637487 has 2 divisors, whose sum is σ = 680637488. Its totient is φ = 680637486.

The previous prime is 680637479. The next prime is 680637527. The reversal of 680637487 is 784736086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680637487 - 2³ = 680637479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680637487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680637407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340318743 + 340318744.

It is an arithmetic number, because the mean of its divisors is an integer number (340318744).

Almost surely, 2^680637487 is an apocalyptic number.

680637487 is a deficient number, since it is larger than the sum of its proper divisors (1).

680637487 is an equidigital number, since it uses as much as digits as its factorization.

680637487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 49.

The square root of 680637487 is about 26089.0300126317. The cubic root of 680637487 is about 879.6406448550.

The spelling of 680637487 in words is "six hundred eighty million, six hundred thirty-seven thousand, four hundred eighty-seven".