680670309 has 32 divisors (see below), whose sum is σ = 1022699520. Its totient is φ = 399132800.

The previous prime is 680670283. The next prime is 680670311. The reversal of 680670309 is 903076086.

It is not a de Polignac number, because 680670309 - 2¹³ = 680662117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680670359) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135574 + ... + 140504.

It is an arithmetic number, because the mean of its divisors is an integer number (31959360).

Almost surely, 2^680670309 is an apocalyptic number.

It is an amenable number.

680670309 is a deficient number, since it is larger than the sum of its proper divisors (342029211).

680670309 is a wasteful number, since it uses less digits than its factorization.

680670309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5081.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 680670309 is about 26089.6590433835. The cubic root of 680670309 is about 879.6547841003.

The spelling of 680670309 in words is "six hundred eighty million, six hundred seventy thousand, three hundred nine".