224428721 has 8 divisors (see below), whose sum is σ = 244942464. Its totient is φ = 203933520.

The previous prime is 224428681. The next prime is 224428723. The reversal of 224428721 is 127824422.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-224428721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224428723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36920 + ... + 42566.

It is an arithmetic number, because the mean of its divisors is an integer number (30617808).

Almost surely, 2^224428721 is an apocalyptic number.

It is an amenable number.

224428721 is a deficient number, since it is larger than the sum of its proper divisors (20513743).

224428721 is a wasteful number, since it uses less digits than its factorization.

224428721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9271.

The product of its digits is 14336, while the sum is 32.

The square root of 224428721 is about 14980.9452639011. The cubic root of 224428721 is about 607.7050026465.

The spelling of 224428721 in words is "two hundred twenty-four million, four hundred twenty-eight thousand, seven hundred twenty-one".