680021 has 8 divisors (see below), whose sum is σ = 712800. Its totient is φ = 647920.

The previous prime is 680003. The next prime is 680027. The reversal of 680021 is 120086.

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

It is a cyclic number.

It is not a de Polignac number, because 680021 - 2⁶ = 679957 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 (680027) 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, 3710 + ... + 3888.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2⁶⁸⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

680021 is a deficient number, since it is larger than the sum of its proper divisors (32779).

680021 is a wasteful number, since it uses less digits than its factorization.

680021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 680021 is about 824.6338581455. The cubic root of 680021 is about 87.9374986635.

The spelling of 680021 in words is "six hundred eighty thousand, twenty-one".