228578261 has 4 divisors (see below), whose sum is σ = 236460300. Its totient is φ = 220696224.

The previous prime is 228578237. The next prime is 228578279. The reversal of 228578261 is 162875822.

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 168220900 + 60357361 = 12970^2 + 7769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228578261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228578201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3940976 + ... + 3941033.

It is an arithmetic number, because the mean of its divisors is an integer number (59115075).

Almost surely, 2^228578261 is an apocalyptic number.

It is an amenable number.

228578261 is a deficient number, since it is larger than the sum of its proper divisors (7882039).

228578261 is an equidigital number, since it uses as much as digits as its factorization.

228578261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7882038.

The product of its digits is 107520, while the sum is 41.

The square root of 228578261 is about 15118.8048800161. The cubic root of 228578261 is about 611.4275095826.

The spelling of 228578261 in words is "two hundred twenty-eight million, five hundred seventy-eight thousand, two hundred sixty-one".