201801888 has 144 divisors (see below), whose sum is σ = 622157760. Its totient is φ = 63628416.

The previous prime is 201801871. The next prime is 201801911. The reversal of 201801888 is 888108102.

It is a happy number.

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

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 311581 + ... + 312227.

It is an arithmetic number, because the mean of its divisors is an integer number (4320540).

Almost surely, 2^201801888 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 201801888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311078880).

201801888 is an abundant number, since it is smaller than the sum of its proper divisors (420355872).

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

201801888 is a wasteful number, since it uses less digits than its factorization.

201801888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 201801888 is about 14205.6991380220. The cubic root of 201801888 is about 586.5545504301.

The spelling of 201801888 in words is "two hundred one million, eight hundred one thousand, eight hundred eighty-eight".