680909787 has 16 divisors (see below), whose sum is σ = 1009322880. Its totient is φ = 453684456.

The previous prime is 680909771. The next prime is 680909791. The reversal of 680909787 is 787909086.

It is not a de Polignac number, because 680909787 - 2⁴ = 680909771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (680909087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50188 + ... + 62294.

It is an arithmetic number, because the mean of its divisors is an integer number (63082680).

Almost surely, 2^680909787 is an apocalyptic number.

680909787 is a deficient number, since it is larger than the sum of its proper divisors (328413093).

680909787 is a wasteful number, since it uses less digits than its factorization.

680909787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14199 (or 14193 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 680909787 is about 26094.2481593166. The cubic root of 680909787 is about 879.7579340224.

It can be divided in two parts, 68090 and 9787, that added together give a palindrome (77877).

The spelling of 680909787 in words is "six hundred eighty million, nine hundred nine thousand, seven hundred eighty-seven".