28720344750 has 128 divisors (see below), whose sum is σ = 72810855936. Its totient is φ = 7539276800.

The previous prime is 28720344739. The next prime is 28720344781. The reversal of 28720344750 is 5744302782.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21973597 + ... + 21974903.

It is an arithmetic number, because the mean of its divisors is an integer number (568834812).

Almost surely, 2^28720344750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28720344750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36405427968).

28720344750 is an abundant number, since it is smaller than the sum of its proper divisors (44090511186).

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

28720344750 is a wasteful number, since it uses less digits than its factorization.

28720344750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 42.

The spelling of 28720344750 in words is "twenty-eight billion, seven hundred twenty million, three hundred forty-four thousand, seven hundred fifty".