128820782 has 8 divisors (see below), whose sum is σ = 193310400. Its totient is φ = 64383984.

The previous prime is 128820773. The next prime is 128820787. The reversal of 128820782 is 287028821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128820787) 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, 6407 + ... + 17282.

It is an arithmetic number, because the mean of its divisors is an integer number (24163800).

Almost surely, 2^128820782 is an apocalyptic number.

128820782 is a deficient number, since it is larger than the sum of its proper divisors (64489618).

128820782 is a wasteful number, since it uses less digits than its factorization.

128820782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26410.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 128820782 is about 11349.9243169283. The cubic root of 128820782 is about 505.0433345161.

The spelling of 128820782 in words is "one hundred twenty-eight million, eight hundred twenty thousand, seven hundred eighty-two".