128438698 has 8 divisors (see below), whose sum is σ = 193812192. Its totient is φ = 63834636.

The previous prime is 128438677. The next prime is 128438699. The reversal of 128438698 is 896834821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (128438699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191940 + ... + 192607.

It is an arithmetic number, because the mean of its divisors is an integer number (24226524).

Almost surely, 2^128438698 is an apocalyptic number.

128438698 is a deficient number, since it is larger than the sum of its proper divisors (65373494).

128438698 is a wasteful number, since it uses less digits than its factorization.

128438698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384716.

The product of its digits is 663552, while the sum is 49.

The square root of 128438698 is about 11333.0798108899. The cubic root of 128438698 is about 504.5435184870.

The spelling of 128438698 in words is "one hundred twenty-eight million, four hundred thirty-eight thousand, six hundred ninety-eight".