128280549817 has 8 divisors (see below), whose sum is σ = 146609229312. Its totient is φ = 109952592000.

The previous prime is 128280549811. The next prime is 128280549821. The reversal of 128280549817 is 718945082821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128280549817 - 2³ = 128280549809 is a prime.

It is a super-2 number, since 2×128280549817² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128280549811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278217 + ... + 577897.

It is an arithmetic number, because the mean of its divisors is an integer number (18326153664).

Almost surely, 2^128280549817 is an apocalyptic number.

It is an amenable number.

128280549817 is a deficient number, since it is larger than the sum of its proper divisors (18328679495).

128280549817 is an equidigital number, since it uses as much as digits as its factorization.

128280549817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360839.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 128280549817 in words is "one hundred twenty-eight billion, two hundred eighty million, five hundred forty-nine thousand, eight hundred seventeen".