28238081040 has 480 divisors, whose sum is σ = 106099209216. Its totient is φ = 6683627520.

The previous prime is 28238081017. The next prime is 28238081107. The reversal of 28238081040 is 4018083282.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 28238080986 and 28238081004.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 89078962 + ... + 89079278.

Almost surely, 2^28238081040 is an apocalyptic number.

28238081040 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 28238081040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53049604608).

28238081040 is an abundant number, since it is smaller than the sum of its proper divisors (77861128176).

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

28238081040 is a wasteful number, since it uses less digits than its factorization.

28238081040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 28238081040 in words is "twenty-eight billion, two hundred thirty-eight million, eighty-one thousand, forty".