128615057280 has 256 divisors, whose sum is σ = 461931724800. Its totient is φ = 33813964800.

The previous prime is 128615057269. The next prime is 128615057281. The reversal of 128615057280 is 82750516821.

128615057280 is a `hidden beast` number, since 1 + 2 + 8 + 61 + 505 + 7 + 2 + 80 = 666.

128615057280 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128615057281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1174465 + ... + 1279295.

It is an arithmetic number, because the mean of its divisors is an integer number (1804420800).

Almost surely, 2^128615057280 is an apocalyptic number.

128615057280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128615057280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230965862400).

128615057280 is an abundant number, since it is smaller than the sum of its proper divisors (333316667520).

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

128615057280 is a wasteful number, since it uses less digits than its factorization.

128615057280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104930 (or 104912 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 128615057280 in words is "one hundred twenty-eight billion, six hundred fifteen million, fifty-seven thousand, two hundred eighty".