228023721 has 16 divisors (see below), whose sum is σ = 338113920. Its totient is φ = 151880400.

The previous prime is 228023707. The next prime is 228023729. The reversal of 228023721 is 127320822.

It is a happy number.

It is not a de Polignac number, because 228023721 - 2⁵ = 228023689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (228023729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33996 + ... + 40146.

It is an arithmetic number, because the mean of its divisors is an integer number (21132120).

Almost surely, 2^228023721 is an apocalyptic number.

It is an amenable number.

228023721 is a deficient number, since it is larger than the sum of its proper divisors (110090199).

228023721 is a wasteful number, since it uses less digits than its factorization.

228023721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7533 (or 7527 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 228023721 is about 15100.4543309134. The cubic root of 228023721 is about 610.9326599970.

The spelling of 228023721 in words is "two hundred twenty-eight million, twenty-three thousand, seven hundred twenty-one".