128239155450 has 504 divisors, whose sum is σ = 423129819744. Its totient is φ = 28312027200.

The previous prime is 128239155437. The next prime is 128239155469. The reversal of 128239155450 is 54551932821.

128239155450 is a `hidden beast` number, since 1 + 2 + 8 + 2 + 3 + 91 + 554 + 5 + 0 = 666.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128239155396 and 128239155405.

It is an unprimeable number.

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 251 ways as a sum of consecutive naturals, for example, 245198889 + ... + 245199411.

Almost surely, 2^128239155450 is an apocalyptic number.

128239155450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128239155450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211564909872).

128239155450 is an abundant number, since it is smaller than the sum of its proper divisors (294890664294).

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

128239155450 is an equidigital number, since it uses as much as digits as its factorization.

128239155450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 128239155450 in words is "one hundred twenty-eight billion, two hundred thirty-nine million, one hundred fifty-five thousand, four hundred fifty".