28808766 has 72 divisors (see below), whose sum is σ = 73625760. Its totient is φ = 8116416.

The previous prime is 28808749. The next prime is 28808779. The reversal of 28808766 is 66780882.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 78315 + ... + 78681.

It is an arithmetic number, because the mean of its divisors is an integer number (1022580).

Almost surely, 2^28808766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28808766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36812880).

28808766 is an abundant number, since it is smaller than the sum of its proper divisors (44816994).

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

28808766 is a wasteful number, since it uses less digits than its factorization.

28808766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 28808766 is about 5367.3798076902. The cubic root of 28808766 is about 306.5548691938.

It can be divided in two parts, 2880876 and 6, that added together give a palindrome (2880882).

The spelling of 28808766 in words is "twenty-eight million, eight hundred eight thousand, seven hundred sixty-six".