28111950720 has 1536 divisors, whose sum is σ = 128314368000. Its totient is φ = 5852528640.

The previous prime is 28111950673. The next prime is 28111950739. The reversal of 28111950720 is 2705911182.

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 an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 906837105 + ... + 906837135.

It is an arithmetic number, because the mean of its divisors is an integer number (83538000).

Almost surely, 2^28111950720 is an apocalyptic number.

28111950720 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 28111950720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64157184000).

28111950720 is an abundant number, since it is smaller than the sum of its proper divisors (100202417280).

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

28111950720 is an equidigital number, since it uses as much as digits as its factorization.

28111950720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The spelling of 28111950720 in words is "twenty-eight billion, one hundred eleven million, nine hundred fifty thousand, seven hundred twenty".