228380287 has 4 divisors (see below), whose sum is σ = 231789016. Its totient is φ = 224971560.

The previous prime is 228380237. The next prime is 228380293. The reversal of 228380287 is 782083822.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 228380287 - 2¹¹ = 228378239 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 (228380237) 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, 1704264 + ... + 1704397.

It is an arithmetic number, because the mean of its divisors is an integer number (57947254).

Almost surely, 2^228380287 is an apocalyptic number.

228380287 is a deficient number, since it is larger than the sum of its proper divisors (3408729).

228380287 is an equidigital number, since it uses as much as digits as its factorization.

228380287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408728.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 228380287 is about 15112.2561849646. The cubic root of 228380287 is about 611.2509373622.

The spelling of 228380287 in words is "two hundred twenty-eight million, three hundred eighty thousand, two hundred eighty-seven".