128309850 has 144 divisors (see below), whose sum is σ = 372372000. Its totient is φ = 31570560.

The previous prime is 128309849. The next prime is 128309879. The reversal of 128309850 is 58903821.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 367476 + ... + 367824.

Almost surely, 2^128309850 is an apocalyptic number.

128309850 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 128309850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186186000).

128309850 is an abundant number, since it is smaller than the sum of its proper divisors (244062150).

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

128309850 is a wasteful number, since it uses less digits than its factorization.

128309850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 128309850 is about 11327.3937867455. The cubic root of 128309850 is about 504.3747449131.

The spelling of 128309850 in words is "one hundred twenty-eight million, three hundred nine thousand, eight hundred fifty".