128447090520 has 128 divisors (see below), whose sum is σ = 450631779840. Its totient is φ = 28676551680.

The previous prime is 128447090509. The next prime is 128447090531. The reversal of 128447090520 is 25090744821.

It is an interprime number because it is at equal distance from previous prime (128447090509) and next prime (128447090531).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1741941 + ... + 1814180.

It is an arithmetic number, because the mean of its divisors is an integer number (3520560780).

Almost surely, 2^128447090520 is an apocalyptic number.

128447090520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128447090520 is an abundant number, since it is smaller than the sum of its proper divisors (322184689320).

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

128447090520 is a wasteful number, since it uses less digits than its factorization.

128447090520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556185 (or 3556181 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 128447090520 in words is "one hundred twenty-eight billion, four hundred forty-seven million, ninety thousand, five hundred twenty".