2181575228 has 24 divisors (see below), whose sum is σ = 4513605600. Its totient is φ = 902720448.

The previous prime is 2181575219. The next prime is 2181575233. The reversal of 2181575228 is 8225751812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1342523 + ... + 1344146.

It is an arithmetic number, because the mean of its divisors is an integer number (188066900).

Almost surely, 2^2181575228 is an apocalyptic number.

2181575228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2181575228 is an abundant number, since it is smaller than the sum of its proper divisors (2332030372).

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

2181575228 is a wasteful number, since it uses less digits than its factorization.

2181575228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686709 (or 2686707 counting only the distinct ones).

The product of its digits is 89600, while the sum is 41.

The square root of 2181575228 is about 46707.3359120385. The cubic root of 2181575228 is about 1296.9504907858.

The spelling of 2181575228 in words is "two billion, one hundred eighty-one million, five hundred seventy-five thousand, two hundred twenty-eight".