1801018080 has 144 divisors (see below), whose sum is σ = 6507590544. Its totient is φ = 452014080.

The previous prime is 1801018049. The next prime is 1801018081. The reversal of 1801018080 is 808101081.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×1801018080² = 6487332248973772800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801018081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12306 + ... + 61265.

It is an arithmetic number, because the mean of its divisors is an integer number (45191601).

Almost surely, 2^1801018080 is an apocalyptic number.

1801018080 is a gapful number since it is divisible by the number (10) 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 1801018080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3253795272).

1801018080 is an abundant number, since it is smaller than the sum of its proper divisors (4706572464).

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

1801018080 is a wasteful number, since it uses less digits than its factorization.

1801018080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73609 (or 73598 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 27.

The square root of 1801018080 is about 42438.4033629919. The cubic root of 1801018080 is about 1216.6696954534.

The spelling of 1801018080 in words is "one billion, eight hundred one million, eighteen thousand, eighty".