128266638240 has 96 divisors (see below), whose sum is σ = 435119924736. Its totient is φ = 31573324800.

The previous prime is 128266638217. The next prime is 128266638329. The reversal of 128266638240 is 42836662821.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 128266638240.

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 15 ways as a sum of consecutive naturals, for example, 10271536 + ... + 10284015.

It is an arithmetic number, because the mean of its divisors is an integer number (4532499216).

Almost surely, 2^128266638240 is an apocalyptic number.

128266638240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128266638240 is an abundant number, since it is smaller than the sum of its proper divisors (306853286496).

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

128266638240 is a wasteful number, since it uses less digits than its factorization.

128266638240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20555582 (or 20555574 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 128266638240 in words is "one hundred twenty-eight billion, two hundred sixty-six million, six hundred thirty-eight thousand, two hundred forty".