128909950 has 24 divisors (see below), whose sum is σ = 258217848. Its totient is φ = 47597280.

The previous prime is 128909947. The next prime is 128909951. The reversal of 128909950 is 59909821.

It is a junction number, because it is equal to n+sod(n) for n = 128909897 and 128909906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128909951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98512 + ... + 99811.

It is an arithmetic number, because the mean of its divisors is an integer number (10759077).

Almost surely, 2^128909950 is an apocalyptic number.

128909950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128909950 is an abundant number, since it is smaller than the sum of its proper divisors (129307898).

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

128909950 is a wasteful number, since it uses less digits than its factorization.

128909950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198348 (or 198343 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 128909950 is about 11353.8517693336. The cubic root of 128909950 is about 505.1598356913.

The spelling of 128909950 in words is "one hundred twenty-eight million, nine hundred nine thousand, nine hundred fifty".