128935573776 has 135 divisors (see below), whose sum is σ = 377501528677. Its totient is φ = 41078294400.

The previous prime is 128935573759. The next prime is 128935573777. The reversal of 128935573776 is 677375539821.

The square root of 128935573776 is 359076.

It is a perfect power (a square), and thus also a powerful number.

128935573776 is a `hidden beast` number, since 1 + 2 + 8 + 9 + 3 + 557 + 3 + 7 + 76 = 666.

It can be written as a sum of positive squares in only one way, i.e., 198133776 + 128737440000 = 14076^2 + 358800^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128935573777) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 99104326 + ... + 99105626.

Almost surely, 2^128935573776 is an apocalyptic number.

128935573776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

128935573776 is the 359076-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128935573776

128935573776 is an abundant number, since it is smaller than the sum of its proper divisors (248565954901).

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

128935573776 is an equidigital number, since it uses as much as digits as its factorization.

128935573776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662 (or 1329 counting only the distinct ones).

The product of its digits is 66679200, while the sum is 63.

The spelling of 128935573776 in words is "one hundred twenty-eight billion, nine hundred thirty-five million, five hundred seventy-three thousand, seven hundred seventy-six".