28065391200 has 1728 divisors, whose sum is σ = 134775373824. Its totient is φ = 5322240000.

The previous prime is 28065391157. The next prime is 28065391213. The reversal of 28065391200 is 219356082.

28065391200 is a `hidden beast` number, since 2 + 8 + 0 + 65 + 391 + 200 = 666.

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 an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 395287165 + ... + 395287235.

It is an arithmetic number, because the mean of its divisors is an integer number (77995008).

Almost surely, 2^28065391200 is an apocalyptic number.

28065391200 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 28065391200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67387686912).

28065391200 is an abundant number, since it is smaller than the sum of its proper divisors (106709982624).

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

28065391200 is a wasteful number, since it uses less digits than its factorization.

28065391200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 28065391200 in words is "twenty-eight billion, sixty-five million, three hundred ninety-one thousand, two hundred".