128891415012740 has 12 divisors (see below), whose sum is σ = 270671971526796. Its totient is φ = 51556566005088.

The previous prime is 128891415012707. The next prime is 128891415012751. The reversal of 128891415012740 is 47210514198821.

It can be written as a sum of positive squares in 2 ways, for example, as 16439473011844 + 112451942000896 = 4054562^2 + 10604336^2 .

It is a super-2 number, since 2×128891415012740² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3222285375299 + ... + 3222285375338.

It is an arithmetic number, because the mean of its divisors is an integer number (22555997627233).

Almost surely, 2^{128891415012740} is an apocalyptic number.

128891415012740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128891415012740 is an abundant number, since it is smaller than the sum of its proper divisors (141780556514056).

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

128891415012740 is a wasteful number, since it uses less digits than its factorization.

128891415012740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6444570750646 (or 6444570750644 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 53.

The spelling of 128891415012740 in words is "one hundred twenty-eight trillion, eight hundred ninety-one billion, four hundred fifteen million, twelve thousand, seven hundred forty".