128866824 has 48 divisors (see below), whose sum is σ = 349537500. Its totient is φ = 42891264.

The previous prime is 128866823. The next prime is 128866849. The reversal of 128866824 is 428668821.

It can be written as a sum of positive squares in 2 ways, for example, as 126562500 + 2304324 = 11250^2 + 1518^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 128866824.

It is not an unprimeable number, because it can be changed into a prime (128866823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89212 + ... + 90644.

Almost surely, 2^128866824 is an apocalyptic number.

It is an amenable number.

128866824 is an abundant number, since it is smaller than the sum of its proper divisors (220670676).

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

128866824 is a wasteful number, since it uses less digits than its factorization.

128866824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694 (or 2687 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 128866824 is about 11351.9524311900. The cubic root of 128866824 is about 505.1034967433.

The spelling of 128866824 in words is "one hundred twenty-eight million, eight hundred sixty-six thousand, eight hundred twenty-four".