221928456 has 16 divisors (see below), whose sum is σ = 554821200. Its totient is φ = 73976144.

The previous prime is 221928433. The next prime is 221928457. The reversal of 221928456 is 654829122.

It is not an unprimeable number, because it can be changed into a prime (221928457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4623486 + ... + 4623533.

It is an arithmetic number, because the mean of its divisors is an integer number (34676325).

Almost surely, 2^221928456 is an apocalyptic number.

It is an amenable number.

221928456 is an abundant number, since it is smaller than the sum of its proper divisors (332892744).

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

221928456 is a wasteful number, since it uses less digits than its factorization.

221928456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9247028 (or 9247024 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 221928456 is about 14897.2633728480. The cubic root of 221928456 is about 605.4398422538.

The spelling of 221928456 in words is "two hundred twenty-one million, nine hundred twenty-eight thousand, four hundred fifty-six".