3028768021 has 4 divisors (see below), whose sum is σ = 3028885132. Its totient is φ = 3028650912.

The previous prime is 3028768019. The next prime is 3028768027. The reversal of 3028768021 is 1208678203.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1208678203 = 13241 ⋅91283.

It can be written as a sum of positive squares in 2 ways, for example, as 616975921 + 2411792100 = 24839^2 + 49110^2 .

It is a cyclic number.

It is not a de Polignac number, because 3028768021 - 2¹ = 3028768019 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 (3028768027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720 + ... + 77833.

It is an arithmetic number, because the mean of its divisors is an integer number (757221283).

Almost surely, 2^3028768021 is an apocalyptic number.

It is an amenable number.

3028768021 is a deficient number, since it is larger than the sum of its proper divisors (117111).

3028768021 is an equidigital number, since it uses as much as digits as its factorization.

3028768021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117110.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 3028768021 is about 55034.2440758479. The cubic root of 3028768021 is about 1446.8449864486.

The spelling of 3028768021 in words is "three billion, twenty-eight million, seven hundred sixty-eight thousand, twenty-one".