680844021 has 32 divisors (see below), whose sum is σ = 1089220608. Its totient is φ = 372776640.

The previous prime is 680844013. The next prime is 680844023. The reversal of 680844021 is 120448086.

It is not a de Polignac number, because 680844021 - 2³ = 680844013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680844023) 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, 3280 + ... + 37046.

It is an arithmetic number, because the mean of its divisors is an integer number (34038144).

Almost surely, 2^680844021 is an apocalyptic number.

It is an amenable number.

680844021 is a deficient number, since it is larger than the sum of its proper divisors (408376587).

680844021 is a wasteful number, since it uses less digits than its factorization.

680844021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33841.

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 680844021 is about 26092.9879661184. The cubic root of 680844021 is about 879.7296091624.

The spelling of 680844021 in words is "six hundred eighty million, eight hundred forty-four thousand, twenty-one".