221728092 has 48 divisors (see below), whose sum is σ = 523908000. Its totient is φ = 72981760.

The previous prime is 221728079. The next prime is 221728099. The reversal of 221728092 is 290827122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221728099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480742 + ... + 481202.

It is an arithmetic number, because the mean of its divisors is an integer number (10914750).

Almost surely, 2^221728092 is an apocalyptic number.

It is an amenable number.

221728092 is an abundant number, since it is smaller than the sum of its proper divisors (302179908).

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

221728092 is a wasteful number, since it uses less digits than its factorization.

221728092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 221728092 is about 14890.5369950180. The cubic root of 221728092 is about 605.2575840070.

The spelling of 221728092 in words is "two hundred twenty-one million, seven hundred twenty-eight thousand, ninety-two".