2028240 has 100 divisors (see below), whose sum is σ = 7066884. Its totient is φ = 539136.

The previous prime is 2028239. The next prime is 2028241. The reversal of 2028240 is 428202.

It is an interprime number because it is at equal distance from previous prime (2028239) and next prime (2028241).

It can be written as a sum of positive squares in 2 ways, for example, as 254016 + 1774224 = 504^2 + 1332^2 .

It is a super-2 number, since 2×2028240² = 8227514995200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2028241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6324 + ... + 6636.

2^2028240 is an apocalyptic number.

2028240 is a gapful number since it is divisible by the number (20) 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 2028240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3533442).

2028240 is an abundant number, since it is smaller than the sum of its proper divisors (5038644).

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

2028240 is a wasteful number, since it uses less digits than its factorization.

2028240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2028240 is about 1424.1629120294. The cubic root of 2028240 is about 126.5823384540.

The spelling of 2028240 in words is "two million, twenty-eight thousand, two hundred forty".