2021768 has 32 divisors (see below), whose sum is σ = 4396800. Its totient is φ = 853632.

The previous prime is 2021743. The next prime is 2021777. The reversal of 2021768 is 8671202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4196 + ... + 4652.

It is an arithmetic number, because the mean of its divisors is an integer number (137400).

2^2021768 is an apocalyptic number.

2021768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2198400).

2021768 is an abundant number, since it is smaller than the sum of its proper divisors (2375032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021768 is a wasteful number, since it uses less digits than its factorization.

2021768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 2021768 is about 1421.8888845476. Note that the first 5 decimals coincide. The cubic root of 2021768 is about 126.4475559453.

The spelling of 2021768 in words is "two million, twenty-one thousand, seven hundred sixty-eight".