128321770 has 8 divisors (see below), whose sum is σ = 230979204. Its totient is φ = 51328704.

The previous prime is 128321737. The next prime is 128321771. The reversal of 128321770 is 77123821.

It can be written as a sum of positive squares in 2 ways, for example, as 123899161 + 4422609 = 11131^2 + 2103^2 .

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

It is not an unprimeable number, because it can be changed into a prime (128321771) 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 3 ways as a sum of consecutive naturals, for example, 6416079 + ... + 6416098.

Almost surely, 2^128321770 is an apocalyptic number.

128321770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128321770 is a deficient number, since it is larger than the sum of its proper divisors (102657434).

128321770 is a wasteful number, since it uses less digits than its factorization.

128321770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12832184.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 128321770 is about 11327.9199326266. The cubic root of 128321770 is about 504.3903632536.

The spelling of 128321770 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, seven hundred seventy".