28120278200 has 96 divisors (see below), whose sum is σ = 74832487200. Its totient is φ = 9626672640.

The previous prime is 28120278167. The next prime is 28120278209. The reversal of 28120278200 is 287202182.

It is a super-3 number, since 3×28120278200³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28120278209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 932966 + ... + 962634.

It is an arithmetic number, because the mean of its divisors is an integer number (779505075).

Almost surely, 2^28120278200 is an apocalyptic number.

28120278200 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 28120278200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37416243600).

28120278200 is an abundant number, since it is smaller than the sum of its proper divisors (46712209000).

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

28120278200 is a wasteful number, since it uses less digits than its factorization.

28120278200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30369 (or 30360 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The spelling of 28120278200 in words is "twenty-eight billion, one hundred twenty million, two hundred seventy-eight thousand, two hundred".