2185191728 has 20 divisors (see below), whose sum is σ = 4417888368. Its totient is φ = 1045091520.

The previous prime is 2185191721. The next prime is 2185191761. The reversal of 2185191728 is 8271915812.

It is not an unprimeable number, because it can be changed into a prime (2185191721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2968643 + ... + 2969378.

Almost surely, 2^2185191728 is an apocalyptic number.

It is an amenable number.

2185191728 is an abundant number, since it is smaller than the sum of its proper divisors (2232696640).

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

2185191728 is a wasteful number, since it uses less digits than its factorization.

2185191728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5938052 (or 5938046 counting only the distinct ones).

The product of its digits is 80640, while the sum is 44.

The square root of 2185191728 is about 46746.0343558681. The cubic root of 2185191728 is about 1297.6667670999. Note that the first 3 decimals are identical.

The spelling of 2185191728 in words is "two billion, one hundred eighty-five million, one hundred ninety-one thousand, seven hundred twenty-eight".