680817479 has 4 divisors (see below), whose sum is σ = 720865584. Its totient is φ = 640769376.

The previous prime is 680817463. The next prime is 680817493. The reversal of 680817479 is 974718086.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 680817479 - 2⁴ = 680817463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680817499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20024027 + ... + 20024060.

It is an arithmetic number, because the mean of its divisors is an integer number (180216396).

Almost surely, 2^680817479 is an apocalyptic number.

680817479 is a deficient number, since it is larger than the sum of its proper divisors (40048105).

680817479 is a wasteful number, since it uses less digits than its factorization.

680817479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40048104.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 680817479 is about 26092.4793570868. The cubic root of 680817479 is about 879.7181772309.

The spelling of 680817479 in words is "six hundred eighty million, eight hundred seventeen thousand, four hundred seventy-nine".