28863156 has 72 divisors (see below), whose sum is σ = 79059456. Its totient is φ = 8171520.

The previous prime is 28863151. The next prime is 28863157. The reversal of 28863156 is 65136882.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28863151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112180 + ... + 112436.

It is an arithmetic number, because the mean of its divisors is an integer number (1098048).

Almost surely, 2^28863156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28863156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39529728).

28863156 is an abundant number, since it is smaller than the sum of its proper divisors (50196300).

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

28863156 is a wasteful number, since it uses less digits than its factorization.

28863156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 460 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 28863156 is about 5372.4441365174. Note that the first 3 decimals coincide. The cubic root of 28863156 is about 306.7476697382.

The spelling of 28863156 in words is "twenty-eight million, eight hundred sixty-three thousand, one hundred fifty-six".