128730394 has 16 divisors (see below), whose sum is σ = 208193832. Its totient is φ = 59344128.

The previous prime is 128730373. The next prime is 128730397. The reversal of 128730394 is 493037821.

It can be written as a sum of positive squares in 4 ways, for example, as 127803025 + 927369 = 11305^2 + 963^2 .

It is not an unprimeable number, because it can be changed into a prime (128730397) 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 7 ways as a sum of consecutive naturals, for example, 24462 + ... + 29254.

Almost surely, 2^128730394 is an apocalyptic number.

128730394 is a deficient number, since it is larger than the sum of its proper divisors (79463438).

128730394 is a wasteful number, since it uses less digits than its factorization.

128730394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5841.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 128730394 is about 11345.9417414334. The cubic root of 128730394 is about 504.9251844857.

The spelling of 128730394 in words is "one hundred twenty-eight million, seven hundred thirty thousand, three hundred ninety-four".