128657081344 has 99 divisors (see below), whose sum is σ = 282972516631. Its totient is φ = 58423101440.

The previous prime is 128657081339. The next prime is 128657081347. The reversal of 128657081344 is 443180756821.

The square root of 128657081344 is 358688.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128657081347) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 126257667 + ... + 126258685.

Almost surely, 2^128657081344 is an apocalyptic number.

128657081344 is the 358688-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128657081344

128657081344 is an abundant number, since it is smaller than the sum of its proper divisors (154315435287).

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

128657081344 is an frugal number, since it uses more digits than its factorization.

128657081344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080 (or 1032 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

Multiplying 128657081344 by its sum of digits (49), we get a square (6304196985856 = 2510816²).

The spelling of 128657081344 in words is "one hundred twenty-eight billion, six hundred fifty-seven million, eighty-one thousand, three hundred forty-four".