28778112 has 128 divisors (see below), whose sum is σ = 92779200. Its totient is φ = 8709120.

The previous prime is 28778111. The next prime is 28778171. The reversal of 28778112 is 21187782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28778111) 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, 37638 + ... + 38394.

Almost surely, 2^28778112 is an apocalyptic number.

28778112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28778112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46389600).

28778112 is an abundant number, since it is smaller than the sum of its proper divisors (64001088).

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

28778112 is a wasteful number, since it uses less digits than its factorization.

28778112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791 (or 773 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 28778112 is about 5364.5234643908. The cubic root of 28778112 is about 306.4461005879.

The spelling of 28778112 in words is "twenty-eight million, seven hundred seventy-eight thousand, one hundred twelve".