28711409800 has 96 divisors (see below), whose sum is σ = 67731914880. Its totient is φ = 11317049600.

The previous prime is 28711409737. The next prime is 28711409801. The reversal of 28711409800 is 890411782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (28711409801) 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 23 ways as a sum of consecutive naturals, for example, 7152594 + ... + 7156606.

It is an arithmetic number, because the mean of its divisors is an integer number (705540780).

Almost surely, 2^28711409800 is an apocalyptic number.

28711409800 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 28711409800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33865957440).

28711409800 is an abundant number, since it is smaller than the sum of its proper divisors (39020505080).

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

28711409800 is a wasteful number, since it uses less digits than its factorization.

28711409800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4543 (or 4534 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The spelling of 28711409800 in words is "twenty-eight billion, seven hundred eleven million, four hundred nine thousand, eight hundred".