128866734 has 32 divisors (see below), whose sum is σ = 289059840. Its totient is φ = 42552216.

The previous prime is 128866693. The next prime is 128866747. The reversal of 128866734 is 437668821.

It is a self number, because there is not a number n which added to its sum of digits gives 128866734.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5374 + ... + 16929.

It is an arithmetic number, because the mean of its divisors is an integer number (9033120).

Almost surely, 2^128866734 is an apocalyptic number.

128866734 is an abundant number, since it is smaller than the sum of its proper divisors (160193106).

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

128866734 is a wasteful number, since it uses less digits than its factorization.

128866734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22421 (or 22415 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 128866734 is about 11351.9484671135. The cubic root of 128866734 is about 505.1033791559.

It can be divided in two parts, 128866 and 734, that added together give a square (129600 = 360²).

The spelling of 128866734 in words is "one hundred twenty-eight million, eight hundred sixty-six thousand, seven hundred thirty-four".