28109239200 has 864 divisors, whose sum is σ = 118474417152. Its totient is φ = 6137856000.

The previous prime is 28109239133. The next prime is 28109239201. The reversal of 28109239200 is 293290182.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28109239201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 126050289 + ... + 126050511.

It is an arithmetic number, because the mean of its divisors is an integer number (137123168).

Almost surely, 2^28109239200 is an apocalyptic number.

28109239200 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 28109239200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59237208576).

28109239200 is an abundant number, since it is smaller than the sum of its proper divisors (90365177952).

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

28109239200 is a wasteful number, since it uses less digits than its factorization.

28109239200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 28109239200 in words is "twenty-eight billion, one hundred nine million, two hundred thirty-nine thousand, two hundred".