228135287 has 4 divisors (see below), whose sum is σ = 229588536. Its totient is φ = 226682040.

The previous prime is 228135263. The next prime is 228135301. The reversal of 228135287 is 782531822.

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 228135287 - 2²⁶ = 161026423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228135287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228135217) 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, 726389 + ... + 726702.

It is an arithmetic number, because the mean of its divisors is an integer number (57397134).

Almost surely, 2^228135287 is an apocalyptic number.

228135287 is a deficient number, since it is larger than the sum of its proper divisors (1453249).

228135287 is a wasteful number, since it uses less digits than its factorization.

228135287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453248.

The product of its digits is 53760, while the sum is 38.

The square root of 228135287 is about 15104.1480064253. The cubic root of 228135287 is about 611.0322815038.

The spelling of 228135287 in words is "two hundred twenty-eight million, one hundred thirty-five thousand, two hundred eighty-seven".