680648421 has 16 divisors (see below), whose sum is σ = 931412160. Its totient is φ = 441866880.

The previous prime is 680648401. The next prime is 680648443. The reversal of 680648421 is 124846086.

It is not a de Polignac number, because 680648421 - 2¹⁷ = 680517349 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 680648421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680648401) 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, 64335 + ... + 74163.

It is an arithmetic number, because the mean of its divisors is an integer number (58213260).

Almost surely, 2^680648421 is an apocalyptic number.

It is an amenable number.

680648421 is a deficient number, since it is larger than the sum of its proper divisors (250763739).

680648421 is a wasteful number, since it uses less digits than its factorization.

680648421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10436.

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 680648421 is about 26089.2395634675. The cubic root of 680648421 is about 879.6453551153.

The spelling of 680648421 in words is "six hundred eighty million, six hundred forty-eight thousand, four hundred twenty-one".