2028021073 has 4 divisors (see below), whose sum is σ = 2184022708. Its totient is φ = 1872019440.

The previous prime is 2028021071. The next prime is 2028021077. The reversal of 2028021073 is 3701208202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1398161664 + 629859409 = 37392^2 + 25097^2 .

It is a cyclic number.

It is not a de Polignac number, because 2028021073 - 2¹ = 2028021071 is a prime.

It is a super-2 number, since 2×2028021073² = 8225738945064142658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2028021071) 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, 78000798 + ... + 78000823.

It is an arithmetic number, because the mean of its divisors is an integer number (546005677).

Almost surely, 2^2028021073 is an apocalyptic number.

It is an amenable number.

2028021073 is a deficient number, since it is larger than the sum of its proper divisors (156001635).

2028021073 is a wasteful number, since it uses less digits than its factorization.

2028021073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156001634.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 2028021073 is about 45033.5549673796. The cubic root of 2028021073 is about 1265.7778388306. Note that the first 3 decimals are identical.

Adding to 2028021073 its reverse (3701208202), we get a palindrome (5729229275).

The spelling of 2028021073 in words is "two billion, twenty-eight million, twenty-one thousand, seventy-three".