680646823 has 8 divisors (see below), whose sum is σ = 719550000. Its totient is φ = 642051648.

The previous prime is 680646803. The next prime is 680646839. The reversal of 680646823 is 328646086.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-680646823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 680646823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680646803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72448 + ... + 81301.

It is an arithmetic number, because the mean of its divisors is an integer number (89943750).

Almost surely, 2^680646823 is an apocalyptic number.

680646823 is a deficient number, since it is larger than the sum of its proper divisors (38903177).

680646823 is a wasteful number, since it uses less digits than its factorization.

680646823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154001.

The product of its (nonzero) digits is 331776, while the sum is 43.

The square root of 680646823 is about 26089.2089377965. The cubic root of 680646823 is about 879.6446667157.

The spelling of 680646823 in words is "six hundred eighty million, six hundred forty-six thousand, eight hundred twenty-three".