680657409 has 12 divisors (see below), whose sum is σ = 983398416. Its totient is φ = 453667032.

The previous prime is 680657401. The next prime is 680657437. The reversal of 680657409 is 904756086.

It is not a de Polignac number, because 680657409 - 2³ = 680657401 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (680657401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68682 + ... + 77964.

It is an arithmetic number, because the mean of its divisors is an integer number (81949868).

Almost surely, 2^680657409 is an apocalyptic number.

It is an amenable number.

680657409 is a deficient number, since it is larger than the sum of its proper divisors (302741007).

680657409 is a wasteful number, since it uses less digits than its factorization.

680657409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17436 (or 17433 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 680657409 is about 26089.4118178237. The cubic root of 680657409 is about 879.6492270201.

The spelling of 680657409 in words is "six hundred eighty million, six hundred fifty-seven thousand, four hundred nine".