228048721 has 4 divisors (see below), whose sum is σ = 235912500. Its totient is φ = 220184944.

The previous prime is 228048719. The next prime is 228048731. The reversal of 228048721 is 127840822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57380625 + 170668096 = 7575^2 + 13064^2 .

It is a cyclic number.

It is not a de Polignac number, because 228048721 - 2¹ = 228048719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228048731) 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, 3931846 + ... + 3931903.

It is an arithmetic number, because the mean of its divisors is an integer number (58978125).

Almost surely, 2^228048721 is an apocalyptic number.

It is an amenable number.

228048721 is a deficient number, since it is larger than the sum of its proper divisors (7863779).

228048721 is an equidigital number, since it uses as much as digits as its factorization.

228048721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7863778.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 228048721 is about 15101.2820978882. The cubic root of 228048721 is about 610.9549862683.

The spelling of 228048721 in words is "two hundred twenty-eight million, forty-eight thousand, seven hundred twenty-one".