28188768 has 24 divisors (see below), whose sum is σ = 73995768. Its totient is φ = 9396224.

The previous prime is 28188757. The next prime is 28188791. The reversal of 28188768 is 86788182.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146721 + ... + 146912.

It is an arithmetic number, because the mean of its divisors is an integer number (3083157).

Almost surely, 2^28188768 is an apocalyptic number.

It is an amenable number.

28188768 is an abundant number, since it is smaller than the sum of its proper divisors (45807000).

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

28188768 is a wasteful number, since it uses less digits than its factorization.

28188768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293646 (or 293638 counting only the distinct ones).

The product of its digits is 344064, while the sum is 48.

The square root of 28188768 is about 5309.3095596320. The cubic root of 28188768 is about 304.3397632457.

The spelling of 28188768 in words is "twenty-eight million, one hundred eighty-eight thousand, seven hundred sixty-eight".