28408309065280 has 112 divisors (see below), whose sum is σ = 74096419111920. Its totient is φ = 10326103359488.

The previous prime is 28408309065217. The next prime is 28408309065287. The reversal of 28408309065280 is 8256090380482.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4564854448704 + 23843454616576 = 2136552^2 + 4882976^2 .

It is not an unprimeable number, because it can be changed into a prime (28408309065287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89878717 + ... + 90194236.

Almost surely, 2^{28408309065280} is an apocalyptic number.

28408309065280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28408309065280 is an abundant number, since it is smaller than the sum of its proper divisors (45688110046640).

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

28408309065280 is a wasteful number, since it uses less digits than its factorization.

28408309065280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180073016 (or 180073006 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 55.

The spelling of 28408309065280 in words is "twenty-eight trillion, four hundred eight billion, three hundred nine million, sixty-five thousand, two hundred eighty".