228728001 has 4 divisors (see below), whose sum is σ = 304970672. Its totient is φ = 152485332.

The previous prime is 228727987. The next prime is 228728021. The reversal of 228728001 is 100827822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 228728001 - 2⁶ = 228727937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 228728001.

It is not an unprimeable number, because it can be changed into a prime (228728021) 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, 38121331 + ... + 38121336.

It is an arithmetic number, because the mean of its divisors is an integer number (76242668).

Almost surely, 2^228728001 is an apocalyptic number.

It is an amenable number.

228728001 is a deficient number, since it is larger than the sum of its proper divisors (76242671).

228728001 is an equidigital number, since it uses as much as digits as its factorization.

228728001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76242670.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 228728001 is about 15123.7561802616. The cubic root of 228728001 is about 611.5609943823.

The spelling of 228728001 in words is "two hundred twenty-eight million, seven hundred twenty-eight thousand, one".