128234638 has 16 divisors (see below), whose sum is σ = 232762464. Its totient is φ = 51724800.

The previous prime is 128234633. The next prime is 128234641. The reversal of 128234638 is 836432821.

It is a junction number, because it is equal to n+sod(n) for n = 128234597 and 128234606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128234633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269163 + ... + 269638.

It is an arithmetic number, because the mean of its divisors is an integer number (14547654).

Almost surely, 2^128234638 is an apocalyptic number.

128234638 is a deficient number, since it is larger than the sum of its proper divisors (104527826).

128234638 is a wasteful number, since it uses less digits than its factorization.

128234638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538827.

The product of its digits is 55296, while the sum is 37.

The square root of 128234638 is about 11324.0733837255. The cubic root of 128234638 is about 504.2761750633.

The spelling of 128234638 in words is "one hundred twenty-eight million, two hundred thirty-four thousand, six hundred thirty-eight".