128949522 has 64 divisors (see below), whose sum is σ = 303657984. Its totient is φ = 36126720.

The previous prime is 128949521. The next prime is 128949533. The reversal of 128949522 is 225949821.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (128949521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39538 + ... + 42674.

It is an arithmetic number, because the mean of its divisors is an integer number (4744656).

Almost surely, 2^128949522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128949522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151828992).

128949522 is an abundant number, since it is smaller than the sum of its proper divisors (174708462).

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

128949522 is a wasteful number, since it uses less digits than its factorization.

128949522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203.

The product of its digits is 103680, while the sum is 42.

The square root of 128949522 is about 11355.5943041305. The cubic root of 128949522 is about 505.2115207109.

The spelling of 128949522 in words is "one hundred twenty-eight million, nine hundred forty-nine thousand, five hundred twenty-two".