128695950 has 72 divisors (see below), whose sum is σ = 366123888. Its totient is φ = 32298240.

The previous prime is 128695913. The next prime is 128695951. The reversal of 128695950 is 59596821.

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

It is a junction number, because it is equal to n+sod(n) for n = 128695896 and 128695905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128695951) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 762 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (5085054).

Almost surely, 2^128695950 is an apocalyptic number.

128695950 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 128695950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183061944).

128695950 is an abundant number, since it is smaller than the sum of its proper divisors (237427938).

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

128695950 is a wasteful number, since it uses less digits than its factorization.

128695950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16858 (or 16850 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 128695950 is about 11344.4237403228. The cubic root of 128695950 is about 504.8801467033.

The spelling of 128695950 in words is "one hundred twenty-eight million, six hundred ninety-five thousand, nine hundred fifty".