28163118 has 32 divisors (see below), whose sum is σ = 61702560. Its totient is φ = 8529920.

The previous prime is 28163117. The next prime is 28163123. The reversal of 28163118 is 81136182.

It is a super-2 number, since 2×28163118² = 1586322430963848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28163117) 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, 1803 + ... + 7718.

It is an arithmetic number, because the mean of its divisors is an integer number (1928205).

Almost surely, 2^28163118 is an apocalyptic number.

28163118 is an abundant number, since it is smaller than the sum of its proper divisors (33539442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28163118 is a wasteful number, since it uses less digits than its factorization.

28163118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9572.

The product of its digits is 2304, while the sum is 30.

The square root of 28163118 is about 5306.8934415532. The cubic root of 28163118 is about 304.2474252398.

The spelling of 28163118 in words is "twenty-eight million, one hundred sixty-three thousand, one hundred eighteen".