128776705536 has 240 divisors, whose sum is σ = 367287706368. Its totient is φ = 40081305600.

The previous prime is 128776705511. The next prime is 128776705549. The reversal of 128776705536 is 635507677821.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39367581 + ... + 39370851.

Almost surely, 2^128776705536 is an apocalyptic number.

128776705536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128776705536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183643853184).

128776705536 is an abundant number, since it is smaller than the sum of its proper divisors (238511000832).

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

128776705536 is an equidigital number, since it uses as much as digits as its factorization.

128776705536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401 (or 3366 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 57.

The spelling of 128776705536 in words is "one hundred twenty-eight billion, seven hundred seventy-six million, seven hundred five thousand, five hundred thirty-six".