228138087 has 4 divisors (see below), whose sum is σ = 304184120. Its totient is φ = 152092056.

The previous prime is 228138019. The next prime is 228138089. The reversal of 228138087 is 780831822.

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

It is a de Polignac number, because none of the positive numbers 2^k-228138087 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 (228138089) 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, 38023012 + ... + 38023017.

It is an arithmetic number, because the mean of its divisors is an integer number (76046030).

Almost surely, 2^228138087 is an apocalyptic number.

228138087 is a deficient number, since it is larger than the sum of its proper divisors (76046033).

228138087 is an equidigital number, since it uses as much as digits as its factorization.

228138087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76046032.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 228138087 is about 15104.2406959105. The cubic root of 228138087 is about 611.0347813120.

The spelling of 228138087 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, eighty-seven".