128820704 has 24 divisors (see below), whose sum is σ = 253984248. Its totient is φ = 64316800.

The previous prime is 128820683. The next prime is 128820737. The reversal of 128820704 is 407028821.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22979 + ... + 28029.

It is an arithmetic number, because the mean of its divisors is an integer number (10582677).

Almost surely, 2^128820704 is an apocalyptic number.

It is an amenable number.

128820704 is a deficient number, since it is larger than the sum of its proper divisors (125163544).

128820704 is an equidigital number, since it uses as much as digits as its factorization.

128820704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5858 (or 5850 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 128820704 is about 11349.9208807815. The cubic root of 128820704 is about 505.0432325828.

The spelling of 128820704 in words is "one hundred twenty-eight million, eight hundred twenty thousand, seven hundred four".