128900400250 has 16 divisors (see below), whose sum is σ = 241301549736. Its totient is φ = 51560160000.

The previous prime is 128900400197. The next prime is 128900400253. The reversal of 128900400250 is 52004009821.

It can be written as a sum of positive squares in 4 ways, for example, as 78319940449 + 50580459801 = 279857^2 + 224901^2 .

It is a super-2 number, since 2×128900400250² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128900400253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257800551 + ... + 257801050.

Almost surely, 2^128900400250 is an apocalyptic number.

128900400250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128900400250 is a deficient number, since it is larger than the sum of its proper divisors (112401149486).

128900400250 is an equidigital number, since it uses as much as digits as its factorization.

128900400250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515601618 (or 515601608 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 128900400250 in words is "one hundred twenty-eight billion, nine hundred million, four hundred thousand, two hundred fifty".