1801728036 has 120 divisors (see below), whose sum is σ = 4883598720. Its totient is φ = 578829888.

The previous prime is 1801728031. The next prime is 1801728041. The reversal of 1801728036 is 6308271081.

It is an interprime number because it is at equal distance from previous prime (1801728031) and next prime (1801728041).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1801728031) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1099810 + ... + 1101446.

It is an arithmetic number, because the mean of its divisors is an integer number (40696656).

Almost surely, 2^1801728036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1801728036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2441799360).

1801728036 is an abundant number, since it is smaller than the sum of its proper divisors (3081870684).

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

1801728036 is a wasteful number, since it uses less digits than its factorization.

1801728036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1801728036 is about 42446.7670853741. The cubic root of 1801728036 is about 1216.8295436497.

The spelling of 1801728036 in words is "one billion, eight hundred one million, seven hundred twenty-eight thousand, thirty-six".