28532715840 has 168 divisors, whose sum is σ = 99750131208. Its totient is φ = 7483944960.

The previous prime is 28532715839. The next prime is 28532715847. The reversal of 28532715840 is 4851723582.

28532715840 is a `hidden beast` number, since 2 + 8 + 532 + 71 + 5 + 8 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4480428096 + 24052287744 = 66936^2 + 155088^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28532715847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94474 + ... + 256886.

It is an arithmetic number, because the mean of its divisors is an integer number (593750781).

Almost surely, 2^28532715840 is an apocalyptic number.

28532715840 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 28532715840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49875065604).

28532715840 is an abundant number, since it is smaller than the sum of its proper divisors (71217415368).

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

28532715840 is a wasteful number, since it uses less digits than its factorization.

28532715840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162497 (or 162484 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 28532715840 in words is "twenty-eight billion, five hundred thirty-two million, seven hundred fifteen thousand, eight hundred forty".