163278285 has 16 divisors (see below), whose sum is σ = 276613056. Its totient is φ = 81959168.

The previous prime is 163278259. The next prime is 163278287. The reversal of 163278285 is 582872361.

It is a cyclic number.

It is not a de Polignac number, because 163278285 - 2¹¹ = 163276237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163278287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319899 + ... + 320408.

It is an arithmetic number, because the mean of its divisors is an integer number (17288316).

Almost surely, 2^163278285 is an apocalyptic number.

163278285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163278285 is a deficient number, since it is larger than the sum of its proper divisors (113334771).

163278285 is a wasteful number, since it uses less digits than its factorization.

163278285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640332.

The product of its digits is 161280, while the sum is 42.

The square root of 163278285 is about 12778.0391688240. The cubic root of 163278285 is about 546.5662489474.

The spelling of 163278285 in words is "one hundred sixty-three million, two hundred seventy-eight thousand, two hundred eighty-five".