28128375840 has 192 divisors, whose sum is σ = 89885085696. Its totient is φ = 7393247232.

The previous prime is 28128375809. The next prime is 28128375893. The reversal of 28128375840 is 4857382182.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 28128375840.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10466977 + ... + 10469663.

It is an arithmetic number, because the mean of its divisors is an integer number (468151488).

Almost surely, 2^28128375840 is an apocalyptic number.

28128375840 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 28128375840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44942542848).

28128375840 is an abundant number, since it is smaller than the sum of its proper divisors (61756709856).

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

28128375840 is a wasteful number, since it uses less digits than its factorization.

28128375840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011 (or 3003 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 48.

The spelling of 28128375840 in words is "twenty-eight billion, one hundred twenty-eight million, three hundred seventy-five thousand, eight hundred forty".