128275720336 has 135 divisors (see below), whose sum is σ = 277202258571. Its totient is φ = 57488335872.

The previous prime is 128275720303. The next prime is 128275720403. The reversal of 128275720336 is 633027572821.

The square root of 128275720336 is 358156.

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

It can be written as a sum of positive squares in 4 ways, for example, as 68027072400 + 60248647936 = 260820^2 + 245456^2 .

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 560155870 + ... + 560156098.

Almost surely, 2^128275720336 is an apocalyptic number.

128275720336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

128275720336 is the 358156-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128275720336

128275720336 is an abundant number, since it is smaller than the sum of its proper divisors (148926538235).

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

128275720336 is an equidigital number, since it uses as much as digits as its factorization.

128275720336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 128275720336 in words is "one hundred twenty-eight billion, two hundred seventy-five million, seven hundred twenty thousand, three hundred thirty-six".