1810728 has 64 divisors (see below), whose sum is σ = 5140800. Its totient is φ = 590400.

The previous prime is 1810723. The next prime is 1810733. The reversal of 1810728 is 8270181.

It is an interprime number because it is at equal distance from previous prime (1810723) and next prime (1810733).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1810723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17878 + ... + 17978.

It is an arithmetic number, because the mean of its divisors is an integer number (80325).

2^1810728 is an apocalyptic number.

1810728 is a gapful number since it is divisible by the number (18) 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 1810728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2570400).

1810728 is an abundant number, since it is smaller than the sum of its proper divisors (3330072).

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

1810728 is a wasteful number, since it uses less digits than its factorization.

1810728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1810728 is about 1345.6329365767. The cubic root of 1810728 is about 121.8852275441.

The spelling of 1810728 in words is "one million, eight hundred ten thousand, seven hundred twenty-eight".