28778200 has 96 divisors (see below), whose sum is σ = 74280960. Its totient is φ = 10281600.

The previous prime is 28778171. The next prime is 28778213. The reversal of 28778200 is 287782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 226537 + ... + 226663.

It is an arithmetic number, because the mean of its divisors is an integer number (773760).

Almost surely, 2^28778200 is an apocalyptic number.

28778200 is a gapful number since it is divisible by the number (20) 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 28778200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37140480).

28778200 is an abundant number, since it is smaller than the sum of its proper divisors (45502760).

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

28778200 is a wasteful number, since it uses less digits than its factorization.

28778200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 28778200 is about 5364.5316664179. The cubic root of 28778200 is about 306.4464129460.

Multiplying 28778200 by its reverse (287782), we get a square (8281847952400 = 2877820²).

28778200 divided by its reverse (287782) gives a square (100 = 10²).

It can be divided in two parts, 287 and 78200, that added together give a palindrome (78487).

The spelling of 28778200 in words is "twenty-eight million, seven hundred seventy-eight thousand, two hundred".