1820288028 has 24 divisors (see below), whose sum is σ = 4574057488. Its totient is φ = 560088576.

The previous prime is 1820288017. The next prime is 1820288033. The reversal of 1820288028 is 8208820281.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5834101 + ... + 5834412.

Almost surely, 2^1820288028 is an apocalyptic number.

It is an amenable number.

1820288028 is an abundant number, since it is smaller than the sum of its proper divisors (2753769460).

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

1820288028 is a wasteful number, since it uses less digits than its factorization.

1820288028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11668533 (or 11668531 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 39.

The square root of 1820288028 is about 42664.8336220827. The cubic root of 1820288028 is about 1220.9935532691.

The spelling of 1820288028 in words is "one billion, eight hundred twenty million, two hundred eighty-eight thousand, twenty-eight".