128649779076 has 192 divisors, whose sum is σ = 389462097920. Its totient is φ = 32097461760.

The previous prime is 128649779053. The next prime is 128649779087. The reversal of 128649779076 is 670977946821.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 128649778998 and 128649779016.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15702141 + ... + 15710331.

Almost surely, 2^128649779076 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128649779076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194731048960).

128649779076 is an abundant number, since it is smaller than the sum of its proper divisors (260812318844).

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

128649779076 is a wasteful number, since it uses less digits than its factorization.

128649779076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8994 (or 8992 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 66.

The spelling of 128649779076 in words is "one hundred twenty-eight billion, six hundred forty-nine million, seven hundred seventy-nine thousand, seventy-six".