128684834 has 16 divisors (see below), whose sum is σ = 205092000. Its totient is φ = 60384384.

The previous prime is 128684827. The next prime is 128684863. The reversal of 128684834 is 438486821.

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, 11759 + ... + 19890.

It is an arithmetic number, because the mean of its divisors is an integer number (12818250).

Almost surely, 2^128684834 is an apocalyptic number.

128684834 is a deficient number, since it is larger than the sum of its proper divisors (76407166).

128684834 is a wasteful number, since it uses less digits than its factorization.

128684834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31777.

The product of its digits is 294912, while the sum is 44.

The square root of 128684834 is about 11343.9337974091. The cubic root of 128684834 is about 504.8656100912.

The spelling of 128684834 in words is "one hundred twenty-eight million, six hundred eighty-four thousand, eight hundred thirty-four".