680657421 has 32 divisors (see below), whose sum is σ = 952565760. Its totient is φ = 431827200.

The previous prime is 680657401. The next prime is 680657437. The reversal of 680657421 is 124756086.

It is not a de Polignac number, because 680657421 - 2⁶ = 680657357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680657421.

It is a congruent number.

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

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2511516 + ... + 2511786.

It is an arithmetic number, because the mean of its divisors is an integer number (29767680).

Almost surely, 2^680657421 is an apocalyptic number.

It is an amenable number.

680657421 is a deficient number, since it is larger than the sum of its proper divisors (271908339).

680657421 is a wasteful number, since it uses less digits than its factorization.

680657421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 680657421 is about 26089.4120478021. The cubic root of 680657421 is about 879.6492321895.

The spelling of 680657421 in words is "six hundred eighty million, six hundred fifty-seven thousand, four hundred twenty-one".