28328895540 has 432 divisors, whose sum is σ = 102858223104. Its totient is φ = 6251212800.

The previous prime is 28328895521. The next prime is 28328895577. The reversal of 28328895540 is 4559882382.

It is a happy number.

28328895540 is a `hidden beast` number, since 2 + 8 + 3 + 2 + 8 + 8 + 95 + 540 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 17738022 + ... + 17739618.

Almost surely, 2^28328895540 is an apocalyptic number.

28328895540 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 28328895540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51429111552).

28328895540 is an abundant number, since it is smaller than the sum of its proper divisors (74529327564).

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

28328895540 is a wasteful number, since it uses less digits than its factorization.

28328895540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688 (or 1666 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 28328895540 in words is "twenty-eight billion, three hundred twenty-eight million, eight hundred ninety-five thousand, five hundred forty".