28380499728 has 240 divisors, whose sum is σ = 90922752000. Its totient is φ = 7583756544.

The previous prime is 28380499717. The next prime is 28380499729. The reversal of 28380499728 is 82799408382.

It is a super-2 number, since 2×28380499728² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28380499729) 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, 3526333 + ... + 3534371.

It is an arithmetic number, because the mean of its divisors is an integer number (378844800).

Almost surely, 2^28380499728 is an apocalyptic number.

28380499728 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 28380499728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45461376000).

28380499728 is an abundant number, since it is smaller than the sum of its proper divisors (62542252272).

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

28380499728 is a wasteful number, since it uses less digits than its factorization.

28380499728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8162 (or 8149 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 60.

The spelling of 28380499728 in words is "twenty-eight billion, three hundred eighty million, four hundred ninety-nine thousand, seven hundred twenty-eight".