28209717900 has 864 divisors, whose sum is σ = 115501940736. Its totient is φ = 5598720000.

The previous prime is 28209717863. The next prime is 28209717953. The reversal of 28209717900 is 971790282.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 104094765 + ... + 104095035.

Almost surely, 2^28209717900 is an apocalyptic number.

28209717900 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 28209717900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57750970368).

28209717900 is an abundant number, since it is smaller than the sum of its proper divisors (87292222836).

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

28209717900 is a wasteful number, since it uses less digits than its factorization.

28209717900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 28209717900 in words is "twenty-eight billion, two hundred nine million, seven hundred seventeen thousand, nine hundred".