128495773926 has 64 divisors (see below), whose sum is σ = 308013935040. Its totient is φ = 39472531200.

The previous prime is 128495773919. The next prime is 128495773927. The reversal of 128495773926 is 629377594821.

128495773926 is a `hidden beast` number, since 1 + 2 + 8 + 4 + 9 + 577 + 39 + 26 = 666.

It is a super-2 number, since 2×128495773926² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128495773927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281026 + ... + 579626.

It is an arithmetic number, because the mean of its divisors is an integer number (4812717735).

Almost surely, 2^128495773926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128495773926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154006967520).

128495773926 is an abundant number, since it is smaller than the sum of its proper divisors (179518161114).

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

128495773926 is a wasteful number, since it uses less digits than its factorization.

128495773926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299238 (or 299232 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 128495773926 in words is "one hundred twenty-eight billion, four hundred ninety-five million, seven hundred seventy-three thousand, nine hundred twenty-six".