28708732240 has 40 divisors (see below), whose sum is σ = 66766831560. Its totient is φ = 11480219136.

The previous prime is 28708732187. The next prime is 28708732259. The reversal of 28708732240 is 4223780782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2623898176 + 26084834064 = 51224^2 + 161508^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241626 + ... + 340294.

It is an arithmetic number, because the mean of its divisors is an integer number (1669170789).

Almost surely, 2^28708732240 is an apocalyptic number.

28708732240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28708732240 is an abundant number, since it is smaller than the sum of its proper divisors (38058099320).

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

28708732240 is a wasteful number, since it uses less digits than its factorization.

28708732240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102319 (or 102313 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 43.

The spelling of 28708732240 in words is "twenty-eight billion, seven hundred eight million, seven hundred thirty-two thousand, two hundred forty".