1820501728 has 24 divisors (see below), whose sum is σ = 3585177288. Its totient is φ = 909980544.

The previous prime is 1820501719. The next prime is 1820501731. The reversal of 1820501728 is 8271050281.

It is a junction number, because it is equal to n+sod(n) for n = 1820501693 and 1820501702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142450 + ... + 154702.

It is an arithmetic number, because the mean of its divisors is an integer number (149382387).

Almost surely, 2^1820501728 is an apocalyptic number.

It is an amenable number.

1820501728 is a deficient number, since it is larger than the sum of its proper divisors (1764675560).

1820501728 is a wasteful number, since it uses less digits than its factorization.

1820501728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16906 (or 16898 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 1820501728 is about 42667.3379530526. The cubic root of 1820501728 is about 1221.0413325414.

The spelling of 1820501728 in words is "one billion, eight hundred twenty million, five hundred one thousand, seven hundred twenty-eight".