128320788 has 24 divisors (see below), whose sum is σ = 301704480. Its totient is φ = 42446560.

The previous prime is 128320783. The next prime is 128320793. The reversal of 128320788 is 887023821.

It is an interprime number because it is at equal distance from previous prime (128320783) and next prime (128320793).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128320783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39243 + ... + 42386.

It is an arithmetic number, because the mean of its divisors is an integer number (12571020).

Almost surely, 2^128320788 is an apocalyptic number.

It is an amenable number.

128320788 is an abundant number, since it is smaller than the sum of its proper divisors (173383692).

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

128320788 is a wasteful number, since it uses less digits than its factorization.

128320788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81767 (or 81765 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 128320788 is about 11327.8765883108. The cubic root of 128320788 is about 504.3890766115.

The spelling of 128320788 in words is "one hundred twenty-eight million, three hundred twenty thousand, seven hundred eighty-eight".