128402445756 has 48 divisors (see below), whose sum is σ = 323293953024. Its totient is φ = 39429875136.

The previous prime is 128402445751. The next prime is 128402445781. The reversal of 128402445756 is 657544204821.

It is a super-2 number, since 2×128402445756² (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 (128402445751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739716 + ... + 896651.

It is an arithmetic number, because the mean of its divisors is an integer number (6735290688).

Almost surely, 2^128402445756 is an apocalyptic number.

It is an amenable number.

128402445756 is an abundant number, since it is smaller than the sum of its proper divisors (194891507268).

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

128402445756 is a wasteful number, since it uses less digits than its factorization.

128402445756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636890 (or 1636888 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 48.

The spelling of 128402445756 in words is "one hundred twenty-eight billion, four hundred two million, four hundred forty-five thousand, seven hundred fifty-six".