228505401 has 8 divisors (see below), whose sum is σ = 338526560. Its totient is φ = 152336916.

The previous prime is 228505379. The next prime is 228505411. The reversal of 228505401 is 104505822.

It is a happy number.

It is not a de Polignac number, because 228505401 - 2⁵ = 228505369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8463163 = 228505401 / (2 + 2 + 8 + 5 + 0 + 5 + 4 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228505411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4231555 + ... + 4231608.

It is an arithmetic number, because the mean of its divisors is an integer number (42315820).

Almost surely, 2^228505401 is an apocalyptic number.

It is an amenable number.

228505401 is a deficient number, since it is larger than the sum of its proper divisors (110021159).

228505401 is an equidigital number, since it uses as much as digits as its factorization.

228505401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8463172 (or 8463166 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 228505401 is about 15116.3951059768. The cubic root of 228505401 is about 611.3625379002.

The spelling of 228505401 in words is "two hundred twenty-eight million, five hundred five thousand, four hundred one".