128505791004 has 24 divisors (see below), whose sum is σ = 300696280080. Its totient is φ = 42713915904.

The previous prime is 128505791003. The next prime is 128505791023. The reversal of 128505791004 is 400197505821.

It is a super-3 number, since 3×128505791004³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128505791003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15164059 + ... + 15172530.

It is an arithmetic number, because the mean of its divisors is an integer number (12529011670).

Almost surely, 2^128505791004 is an apocalyptic number.

It is an amenable number.

128505791004 is an abundant number, since it is smaller than the sum of its proper divisors (172190489076).

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

128505791004 is a wasteful number, since it uses less digits than its factorization.

128505791004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30336949 (or 30336947 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 42.

The spelling of 128505791004 in words is "one hundred twenty-eight billion, five hundred five million, seven hundred ninety-one thousand, four".