28720048500 has 1344 divisors, whose sum is σ = 120310444800. Its totient is φ = 5878656000.

The previous prime is 28720048463. The next prime is 28720048501. The reversal of 28720048500 is 584002782.

It is a happy number.

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 (28720048501) by changing a digit.

It is a polite number, since it can be written in 447 ways as a sum of consecutive naturals, for example, 990346486 + ... + 990346514.

It is an arithmetic number, because the mean of its divisors is an integer number (89516700).

Almost surely, 2^28720048500 is an apocalyptic number.

28720048500 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 28720048500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60155222400).

28720048500 is an abundant number, since it is smaller than the sum of its proper divisors (91590396300).

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

28720048500 is a wasteful number, since it uses less digits than its factorization.

28720048500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The spelling of 28720048500 in words is "twenty-eight billion, seven hundred twenty million, forty-eight thousand, five hundred".