28120421448 has 192 divisors, whose sum is σ = 89129040000. Its totient is φ = 8006076288.

The previous prime is 28120421447. The next prime is 28120421453. The reversal of 28120421448 is 84412402182.

It is a happy number.

28120421448 is a `hidden beast` number, since 2 + 8 + 1 + 204 + 2 + 1 + 448 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28120421443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7579818 + ... + 7583526.

It is an arithmetic number, because the mean of its divisors is an integer number (464213750).

Almost surely, 2^28120421448 is an apocalyptic number.

28120421448 is a gapful number since it is divisible by the number (28) 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 28120421448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44564520000).

28120421448 is an abundant number, since it is smaller than the sum of its proper divisors (61008618552).

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

28120421448 is a wasteful number, since it uses less digits than its factorization.

28120421448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4049 (or 4028 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 36.

The spelling of 28120421448 in words is "twenty-eight billion, one hundred twenty million, four hundred twenty-one thousand, four hundred forty-eight".