1800539664 has 160 divisors (see below), whose sum is σ = 5823912960. Its totient is φ = 465676800.

The previous prime is 1800539647. The next prime is 1800539669. The reversal of 1800539664 is 4669350081.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1800539669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 993319 + ... + 995129.

It is an arithmetic number, because the mean of its divisors is an integer number (36399456).

Almost surely, 2^1800539664 is an apocalyptic number.

1800539664 is a gapful number since it is divisible by the number (14) 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 1800539664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2911956480).

1800539664 is an abundant number, since it is smaller than the sum of its proper divisors (4023373296).

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

1800539664 is a wasteful number, since it uses less digits than its factorization.

1800539664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109 (or 2103 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1800539664 is about 42432.7663957937. The cubic root of 1800539664 is about 1216.5619553177.

The spelling of 1800539664 in words is "one billion, eight hundred million, five hundred thirty-nine thousand, six hundred sixty-four".