28159068240 has 180 divisors, whose sum is σ = 97718909652. Its totient is φ = 7266677760.

The previous prime is 28159068233. The next prime is 28159068251. The reversal of 28159068240 is 4286095182.

It can be written as a sum of positive squares in 2 ways, for example, as 3631749696 + 24527318544 = 60264^2 + 156612^2 .

It is a tau number, because it is divible by the number of its divisors (180).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 671572 + ... + 712268.

Almost surely, 2^28159068240 is an apocalyptic number.

28159068240 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 28159068240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48859454826).

28159068240 is an abundant number, since it is smaller than the sum of its proper divisors (69559841412).

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

28159068240 is a wasteful number, since it uses less digits than its factorization.

28159068240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40778 (or 40738 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 28159068240 in words is "twenty-eight billion, one hundred fifty-nine million, sixty-eight thousand, two hundred forty".