128600438 has 4 divisors (see below), whose sum is σ = 192900660. Its totient is φ = 64300218.

The previous prime is 128600399. The next prime is 128600443. The reversal of 128600438 is 834006821.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32150108 + ... + 32150111.

It is an arithmetic number, because the mean of its divisors is an integer number (48225165).

Almost surely, 2^128600438 is an apocalyptic number.

128600438 is a deficient number, since it is larger than the sum of its proper divisors (64300222).

128600438 is an equidigital number, since it uses as much as digits as its factorization.

128600438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64300221.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 128600438 is about 11340.2133136904. The cubic root of 128600438 is about 504.7552164656.

The spelling of 128600438 in words is "one hundred twenty-eight million, six hundred thousand, four hundred thirty-eight".