680728919 has 16 divisors (see below), whose sum is σ = 759988320. Its totient is φ = 605404800.

The previous prime is 680728897. The next prime is 680728927. The reversal of 680728919 is 919827086.

It is not a de Polignac number, because 680728919 - 2²⁴ = 663951703 is a prime.

It is a super-2 number, since 2×680728919² = 926783722325817122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680728319) 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, 204569 + ... + 207869.

It is an arithmetic number, because the mean of its divisors is an integer number (47499270).

Almost surely, 2^680728919 is an apocalyptic number.

680728919 is a deficient number, since it is larger than the sum of its proper divisors (79259401).

680728919 is a wasteful number, since it uses less digits than its factorization.

680728919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3890.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 680728919 is about 26090.7822611742. The cubic root of 680728919 is about 879.6800313144.

The spelling of 680728919 in words is "six hundred eighty million, seven hundred twenty-eight thousand, nine hundred nineteen".