128494677888 has 160 divisors (see below), whose sum is σ = 404892639360. Its totient is φ = 40312000512.

The previous prime is 128494677881. The next prime is 128494677911. The reversal of 128494677888 is 888776494821.

128494677888 is a `hidden beast` number, since 1 + 2 + 8 + 494 + 67 + 78 + 8 + 8 = 666.

It is a super-2 number, since 2×128494677888² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128494677881) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 188256 + ... + 540767.

It is an arithmetic number, because the mean of its divisors is an integer number (2530578996).

Almost surely, 2^128494677888 is an apocalyptic number.

128494677888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128494677888 is an abundant number, since it is smaller than the sum of its proper divisors (276397961472).

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

128494677888 is an equidigital number, since it uses as much as digits as its factorization.

128494677888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729066 (or 729045 counting only the distinct ones).

The product of its digits is 346816512, while the sum is 72.

The spelling of 128494677888 in words is "one hundred twenty-eight billion, four hundred ninety-four million, six hundred seventy-seven thousand, eight hundred eighty-eight".