128009634 has 16 divisors (see below), whose sum is σ = 256154400. Its totient is φ = 42647360.

The previous prime is 128009627. The next prime is 128009657. The reversal of 128009634 is 436900821.

It is a junction number, because it is equal to n+sod(n) for n = 128009595 and 128009604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10042 + ... + 18890.

It is an arithmetic number, because the mean of its divisors is an integer number (16009650).

Almost surely, 2^128009634 is an apocalyptic number.

128009634 is an abundant number, since it is smaller than the sum of its proper divisors (128144766).

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

128009634 is a wasteful number, since it uses less digits than its factorization.

128009634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11265.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 128009634 is about 11314.1342576443. The cubic root of 128009634 is about 503.9810634735.

The spelling of 128009634 in words is "one hundred twenty-eight million, nine thousand, six hundred thirty-four".