128838776386464 has 48 divisors (see below), whose sum is σ = 375779764463040. Its totient is φ = 42946258795200.

The previous prime is 128838776386459. The next prime is 128838776386553. The reversal of 128838776386464 is 464683677838821.

128838776386464 is a `hidden beast` number, since 1 + 2 + 8 + 8 + 3 + 8 + 7 + 76 + 3 + 86 + 464 = 666.

128838776386464 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×128838776386464² (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 (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74559476212 + ... + 74559477939.

It is an arithmetic number, because the mean of its divisors is an integer number (7828745092980).

Almost surely, 2^{128838776386464} is an apocalyptic number.

It is an amenable number.

128838776386464 is an abundant number, since it is smaller than the sum of its proper divisors (246940988076576).

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

128838776386464 is a wasteful number, since it uses less digits than its factorization.

128838776386464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149118954170 (or 149118954156 counting only the distinct ones).

The product of its digits is 12485394432, while the sum is 81.

The spelling of 128838776386464 in words is "one hundred twenty-eight trillion, eight hundred thirty-eight billion, seven hundred seventy-six million, three hundred eighty-six thousand, four hundred sixty-four".